diff --git a/wp-includes/js/backbone.min.js b/wp-includes/js/backbone.min.js
index 8555ecaf29..d4afb45fc2 100644
--- a/wp-includes/js/backbone.min.js
+++ b/wp-includes/js/backbone.min.js
@@ -1,7 +1 @@
-// Backbone.js 1.0.0
-
-// (c) 2010-2013 Jeremy Ashkenas, DocumentCloud Inc.
-// Backbone may be freely distributed under the MIT license.
-// For all details and documentation:
-// http://backbonejs.org
-(function(){var t=this;var e=t.Backbone;var i=[];var r=i.push;var s=i.slice;var n=i.splice;var a;if(typeof exports!=="undefined"){a=exports}else{a=t.Backbone={}}a.VERSION="1.0.0";var h=t._;if(!h&&typeof require!=="undefined")h=require("underscore");a.$=t.jQuery||t.Zepto||t.ender||t.$;a.noConflict=function(){t.Backbone=e;return this};a.emulateHTTP=false;a.emulateJSON=false;var o=a.Events={on:function(t,e,i){if(!l(this,"on",t,[e,i])||!e)return this;this._events||(this._events={});var r=this._events[t]||(this._events[t]=[]);r.push({callback:e,context:i,ctx:i||this});return this},once:function(t,e,i){if(!l(this,"once",t,[e,i])||!e)return this;var r=this;var s=h.once(function(){r.off(t,s);e.apply(this,arguments)});s._callback=e;return this.on(t,s,i)},off:function(t,e,i){var r,s,n,a,o,u,c,f;if(!this._events||!l(this,"off",t,[e,i]))return this;if(!t&&!e&&!i){this._events={};return this}a=t?[t]:h.keys(this._events);for(o=0,u=a.length;o<u;o++){t=a[o];if(n=this._events[t]){this._events[t]=r=[];if(e||i){for(c=0,f=n.length;c<f;c++){s=n[c];if(e&&e!==s.callback&&e!==s.callback._callback||i&&i!==s.context){r.push(s)}}}if(!r.length)delete this._events[t]}}return this},trigger:function(t){if(!this._events)return this;var e=s.call(arguments,1);if(!l(this,"trigger",t,e))return this;var i=this._events[t];var r=this._events.all;if(i)c(i,e);if(r)c(r,arguments);return this},stopListening:function(t,e,i){var r=this._listeners;if(!r)return this;var s=!e&&!i;if(typeof e==="object")i=this;if(t)(r={})[t._listenerId]=t;for(var n in r){r[n].off(e,i,this);if(s)delete this._listeners[n]}return this}};var u=/\s+/;var l=function(t,e,i,r){if(!i)return true;if(typeof i==="object"){for(var s in i){t[e].apply(t,[s,i[s]].concat(r))}return false}if(u.test(i)){var n=i.split(u);for(var a=0,h=n.length;a<h;a++){t[e].apply(t,[n[a]].concat(r))}return false}return true};var c=function(t,e){var i,r=-1,s=t.length,n=e[0],a=e[1],h=e[2];switch(e.length){case 0:while(++r<s)(i=t[r]).callback.call(i.ctx);return;case 1:while(++r<s)(i=t[r]).callback.call(i.ctx,n);return;case 2:while(++r<s)(i=t[r]).callback.call(i.ctx,n,a);return;case 3:while(++r<s)(i=t[r]).callback.call(i.ctx,n,a,h);return;default:while(++r<s)(i=t[r]).callback.apply(i.ctx,e)}};var f={listenTo:"on",listenToOnce:"once"};h.each(f,function(t,e){o[e]=function(e,i,r){var s=this._listeners||(this._listeners={});var n=e._listenerId||(e._listenerId=h.uniqueId("l"));s[n]=e;if(typeof i==="object")r=this;e[t](i,r,this);return this}});o.bind=o.on;o.unbind=o.off;h.extend(a,o);var d=a.Model=function(t,e){var i;var r=t||{};e||(e={});this.cid=h.uniqueId("c");this.attributes={};h.extend(this,h.pick(e,p));if(e.parse)r=this.parse(r,e)||{};if(i=h.result(this,"defaults")){r=h.defaults({},r,i)}this.set(r,e);this.changed={};this.initialize.apply(this,arguments)};var p=["url","urlRoot","collection"];h.extend(d.prototype,o,{changed:null,validationError:null,idAttribute:"id",initialize:function(){},toJSON:function(t){return h.clone(this.attributes)},sync:function(){return a.sync.apply(this,arguments)},get:function(t){return this.attributes[t]},escape:function(t){return h.escape(this.get(t))},has:function(t){return this.get(t)!=null},set:function(t,e,i){var r,s,n,a,o,u,l,c;if(t==null)return this;if(typeof t==="object"){s=t;i=e}else{(s={})[t]=e}i||(i={});if(!this._validate(s,i))return false;n=i.unset;o=i.silent;a=[];u=this._changing;this._changing=true;if(!u){this._previousAttributes=h.clone(this.attributes);this.changed={}}c=this.attributes,l=this._previousAttributes;if(this.idAttribute in s)this.id=s[this.idAttribute];for(r in s){e=s[r];if(!h.isEqual(c[r],e))a.push(r);if(!h.isEqual(l[r],e)){this.changed[r]=e}else{delete this.changed[r]}n?delete c[r]:c[r]=e}if(!o){if(a.length)this._pending=true;for(var f=0,d=a.length;f<d;f++){this.trigger("change:"+a[f],this,c[a[f]],i)}}if(u)return this;if(!o){while(this._pending){this._pending=false;this.trigger("change",this,i)}}this._pending=false;this._changing=false;return this},unset:function(t,e){return this.set(t,void 0,h.extend({},e,{unset:true}))},clear:function(t){var e={};for(var i in this.attributes)e[i]=void 0;return this.set(e,h.extend({},t,{unset:true}))},hasChanged:function(t){if(t==null)return!h.isEmpty(this.changed);return h.has(this.changed,t)},changedAttributes:function(t){if(!t)return this.hasChanged()?h.clone(this.changed):false;var e,i=false;var r=this._changing?this._previousAttributes:this.attributes;for(var s in t){if(h.isEqual(r[s],e=t[s]))continue;(i||(i={}))[s]=e}return i},previous:function(t){if(t==null||!this._previousAttributes)return null;return this._previousAttributes[t]},previousAttributes:function(){return h.clone(this._previousAttributes)},fetch:function(t){t=t?h.clone(t):{};if(t.parse===void 0)t.parse=true;var e=this;var i=t.success;t.success=function(r){if(!e.set(e.parse(r,t),t))return false;if(i)i(e,r,t);e.trigger("sync",e,r,t)};R(this,t);return this.sync("read",this,t)},save:function(t,e,i){var r,s,n,a=this.attributes;if(t==null||typeof t==="object"){r=t;i=e}else{(r={})[t]=e}if(r&&(!i||!i.wait)&&!this.set(r,i))return false;i=h.extend({validate:true},i);if(!this._validate(r,i))return false;if(r&&i.wait){this.attributes=h.extend({},a,r)}if(i.parse===void 0)i.parse=true;var o=this;var u=i.success;i.success=function(t){o.attributes=a;var e=o.parse(t,i);if(i.wait)e=h.extend(r||{},e);if(h.isObject(e)&&!o.set(e,i)){return false}if(u)u(o,t,i);o.trigger("sync",o,t,i)};R(this,i);s=this.isNew()?"create":i.patch?"patch":"update";if(s==="patch")i.attrs=r;n=this.sync(s,this,i);if(r&&i.wait)this.attributes=a;return n},destroy:function(t){t=t?h.clone(t):{};var e=this;var i=t.success;var r=function(){e.trigger("destroy",e,e.collection,t)};t.success=function(s){if(t.wait||e.isNew())r();if(i)i(e,s,t);if(!e.isNew())e.trigger("sync",e,s,t)};if(this.isNew()){t.success();return false}R(this,t);var s=this.sync("delete",this,t);if(!t.wait)r();return s},url:function(){var t=h.result(this,"urlRoot")||h.result(this.collection,"url")||U();if(this.isNew())return t;return t+(t.charAt(t.length-1)==="/"?"":"/")+encodeURIComponent(this.id)},parse:function(t,e){return t},clone:function(){return new this.constructor(this.attributes)},isNew:function(){return this.id==null},isValid:function(t){return this._validate({},h.extend(t||{},{validate:true}))},_validate:function(t,e){if(!e.validate||!this.validate)return true;t=h.extend({},this.attributes,t);var i=this.validationError=this.validate(t,e)||null;if(!i)return true;this.trigger("invalid",this,i,h.extend(e||{},{validationError:i}));return false}});var v=["keys","values","pairs","invert","pick","omit"];h.each(v,function(t){d.prototype[t]=function(){var e=s.call(arguments);e.unshift(this.attributes);return h[t].apply(h,e)}});var g=a.Collection=function(t,e){e||(e={});if(e.url)this.url=e.url;if(e.model)this.model=e.model;if(e.comparator!==void 0)this.comparator=e.comparator;this._reset();this.initialize.apply(this,arguments);if(t)this.reset(t,h.extend({silent:true},e))};var m={add:true,remove:true,merge:true};var y={add:true,merge:false,remove:false};h.extend(g.prototype,o,{model:d,initialize:function(){},toJSON:function(t){return this.map(function(e){return e.toJSON(t)})},sync:function(){return a.sync.apply(this,arguments)},add:function(t,e){return this.set(t,h.defaults(e||{},y))},remove:function(t,e){t=h.isArray(t)?t.slice():[t];e||(e={});var i,r,s,n;for(i=0,r=t.length;i<r;i++){n=this.get(t[i]);if(!n)continue;delete this._byId[n.id];delete this._byId[n.cid];s=this.indexOf(n);this.models.splice(s,1);this.length--;if(!e.silent){e.index=s;n.trigger("remove",n,this,e)}this._removeReference(n)}return this},set:function(t,e){e=h.defaults(e||{},m);if(e.parse)t=this.parse(t,e);if(!h.isArray(t))t=t?[t]:[];var i,s,a,o,u,l;var c=e.at;var f=this.comparator&&c==null&&e.sort!==false;var d=h.isString(this.comparator)?this.comparator:null;var p=[],v=[],g={};for(i=0,s=t.length;i<s;i++){if(!(a=this._prepareModel(t[i],e)))continue;if(u=this.get(a)){if(e.remove)g[u.cid]=true;if(e.merge){u.set(a.attributes,e);if(f&&!l&&u.hasChanged(d))l=true}}else if(e.add){p.push(a);a.on("all",this._onModelEvent,this);this._byId[a.cid]=a;if(a.id!=null)this._byId[a.id]=a}}if(e.remove){for(i=0,s=this.length;i<s;++i){if(!g[(a=this.models[i]).cid])v.push(a)}if(v.length)this.remove(v,e)}if(p.length){if(f)l=true;this.length+=p.length;if(c!=null){n.apply(this.models,[c,0].concat(p))}else{r.apply(this.models,p)}}if(l)this.sort({silent:true});if(e.silent)return this;for(i=0,s=p.length;i<s;i++){(a=p[i]).trigger("add",a,this,e)}if(l)this.trigger("sort",this,e);return this},reset:function(t,e){e||(e={});for(var i=0,r=this.models.length;i<r;i++){this._removeReference(this.models[i])}e.previousModels=this.models;this._reset();this.add(t,h.extend({silent:true},e));if(!e.silent)this.trigger("reset",this,e);return this},push:function(t,e){t=this._prepareModel(t,e);this.add(t,h.extend({at:this.length},e));return t},pop:function(t){var e=this.at(this.length-1);this.remove(e,t);return e},unshift:function(t,e){t=this._prepareModel(t,e);this.add(t,h.extend({at:0},e));return t},shift:function(t){var e=this.at(0);this.remove(e,t);return e},slice:function(t,e){return this.models.slice(t,e)},get:function(t){if(t==null)return void 0;return this._byId[t.id!=null?t.id:t.cid||t]},at:function(t){return this.models[t]},where:function(t,e){if(h.isEmpty(t))return e?void 0:[];return this[e?"find":"filter"](function(e){for(var i in t){if(t[i]!==e.get(i))return false}return true})},findWhere:function(t){return this.where(t,true)},sort:function(t){if(!this.comparator)throw new Error("Cannot sort a set without a comparator");t||(t={});if(h.isString(this.comparator)||this.comparator.length===1){this.models=this.sortBy(this.comparator,this)}else{this.models.sort(h.bind(this.comparator,this))}if(!t.silent)this.trigger("sort",this,t);return this},sortedIndex:function(t,e,i){e||(e=this.comparator);var r=h.isFunction(e)?e:function(t){return t.get(e)};return h.sortedIndex(this.models,t,r,i)},pluck:function(t){return h.invoke(this.models,"get",t)},fetch:function(t){t=t?h.clone(t):{};if(t.parse===void 0)t.parse=true;var e=t.success;var i=this;t.success=function(r){var s=t.reset?"reset":"set";i[s](r,t);if(e)e(i,r,t);i.trigger("sync",i,r,t)};R(this,t);return this.sync("read",this,t)},create:function(t,e){e=e?h.clone(e):{};if(!(t=this._prepareModel(t,e)))return false;if(!e.wait)this.add(t,e);var i=this;var r=e.success;e.success=function(s){if(e.wait)i.add(t,e);if(r)r(t,s,e)};t.save(null,e);return t},parse:function(t,e){return t},clone:function(){return new this.constructor(this.models)},_reset:function(){this.length=0;this.models=[];this._byId={}},_prepareModel:function(t,e){if(t instanceof d){if(!t.collection)t.collection=this;return t}e||(e={});e.collection=this;var i=new this.model(t,e);if(!i._validate(t,e)){this.trigger("invalid",this,t,e);return false}return i},_removeReference:function(t){if(this===t.collection)delete t.collection;t.off("all",this._onModelEvent,this)},_onModelEvent:function(t,e,i,r){if((t==="add"||t==="remove")&&i!==this)return;if(t==="destroy")this.remove(e,r);if(e&&t==="change:"+e.idAttribute){delete this._byId[e.previous(e.idAttribute)];if(e.id!=null)this._byId[e.id]=e}this.trigger.apply(this,arguments)}});var _=["forEach","each","map","collect","reduce","foldl","inject","reduceRight","foldr","find","detect","filter","select","reject","every","all","some","any","include","contains","invoke","max","min","toArray","size","first","head","take","initial","rest","tail","drop","last","without","indexOf","shuffle","lastIndexOf","isEmpty","chain"];h.each(_,function(t){g.prototype[t]=function(){var e=s.call(arguments);e.unshift(this.models);return h[t].apply(h,e)}});var w=["groupBy","countBy","sortBy"];h.each(w,function(t){g.prototype[t]=function(e,i){var r=h.isFunction(e)?e:function(t){return t.get(e)};return h[t](this.models,r,i)}});var b=a.View=function(t){this.cid=h.uniqueId("view");this._configure(t||{});this._ensureElement();this.initialize.apply(this,arguments);this.delegateEvents()};var x=/^(\S+)\s*(.*)$/;var E=["model","collection","el","id","attributes","className","tagName","events"];h.extend(b.prototype,o,{tagName:"div",$:function(t){return this.$el.find(t)},initialize:function(){},render:function(){return this},remove:function(){this.$el.remove();this.stopListening();return this},setElement:function(t,e){if(this.$el)this.undelegateEvents();this.$el=t instanceof a.$?t:a.$(t);this.el=this.$el[0];if(e!==false)this.delegateEvents();return this},delegateEvents:function(t){if(!(t||(t=h.result(this,"events"))))return this;this.undelegateEvents();for(var e in t){var i=t[e];if(!h.isFunction(i))i=this[t[e]];if(!i)continue;var r=e.match(x);var s=r[1],n=r[2];i=h.bind(i,this);s+=".delegateEvents"+this.cid;if(n===""){this.$el.on(s,i)}else{this.$el.on(s,n,i)}}return this},undelegateEvents:function(){this.$el.off(".delegateEvents"+this.cid);return this},_configure:function(t){if(this.options)t=h.extend({},h.result(this,"options"),t);h.extend(this,h.pick(t,E));this.options=t},_ensureElement:function(){if(!this.el){var t=h.extend({},h.result(this,"attributes"));if(this.id)t.id=h.result(this,"id");if(this.className)t["class"]=h.result(this,"className");var e=a.$("<"+h.result(this,"tagName")+">").attr(t);this.setElement(e,false)}else{this.setElement(h.result(this,"el"),false)}}});a.sync=function(t,e,i){var r=k[t];h.defaults(i||(i={}),{emulateHTTP:a.emulateHTTP,emulateJSON:a.emulateJSON});var s={type:r,dataType:"json"};if(!i.url){s.url=h.result(e,"url")||U()}if(i.data==null&&e&&(t==="create"||t==="update"||t==="patch")){s.contentType="application/json";s.data=JSON.stringify(i.attrs||e.toJSON(i))}if(i.emulateJSON){s.contentType="application/x-www-form-urlencoded";s.data=s.data?{model:s.data}:{}}if(i.emulateHTTP&&(r==="PUT"||r==="DELETE"||r==="PATCH")){s.type="POST";if(i.emulateJSON)s.data._method=r;var n=i.beforeSend;i.beforeSend=function(t){t.setRequestHeader("X-HTTP-Method-Override",r);if(n)return n.apply(this,arguments)}}if(s.type!=="GET"&&!i.emulateJSON){s.processData=false}if(s.type==="PATCH"&&window.ActiveXObject&&!(window.external&&window.external.msActiveXFilteringEnabled)){s.xhr=function(){return new ActiveXObject("Microsoft.XMLHTTP")}}var o=i.xhr=a.ajax(h.extend(s,i));e.trigger("request",e,o,i);return o};var k={create:"POST",update:"PUT",patch:"PATCH","delete":"DELETE",read:"GET"};a.ajax=function(){return a.$.ajax.apply(a.$,arguments)};var S=a.Router=function(t){t||(t={});if(t.routes)this.routes=t.routes;this._bindRoutes();this.initialize.apply(this,arguments)};var $=/\((.*?)\)/g;var T=/(\(\?)?:\w+/g;var H=/\*\w+/g;var A=/[\-{}\[\]+?.,\\\^$|#\s]/g;h.extend(S.prototype,o,{initialize:function(){},route:function(t,e,i){if(!h.isRegExp(t))t=this._routeToRegExp(t);if(h.isFunction(e)){i=e;e=""}if(!i)i=this[e];var r=this;a.history.route(t,function(s){var n=r._extractParameters(t,s);i&&i.apply(r,n);r.trigger.apply(r,["route:"+e].concat(n));r.trigger("route",e,n);a.history.trigger("route",r,e,n)});return this},navigate:function(t,e){a.history.navigate(t,e);return this},_bindRoutes:function(){if(!this.routes)return;this.routes=h.result(this,"routes");var t,e=h.keys(this.routes);while((t=e.pop())!=null){this.route(t,this.routes[t])}},_routeToRegExp:function(t){t=t.replace(A,"\\$&").replace($,"(?:$1)?").replace(T,function(t,e){return e?t:"([^/]+)"}).replace(H,"(.*?)");return new RegExp("^"+t+"$")},_extractParameters:function(t,e){var i=t.exec(e).slice(1);return h.map(i,function(t){return t?decodeURIComponent(t):null})}});var I=a.History=function(){this.handlers=[];h.bindAll(this,"checkUrl");if(typeof window!=="undefined"){this.location=window.location;this.history=window.history}};var N=/^[#\/]|\s+$/g;var P=/^\/+|\/+$/g;var O=/msie [\w.]+/;var C=/\/$/;I.started=false;h.extend(I.prototype,o,{interval:50,getHash:function(t){var e=(t||this).location.href.match(/#(.*)$/);return e?e[1]:""},getFragment:function(t,e){if(t==null){if(this._hasPushState||!this._wantsHashChange||e){t=this.location.pathname;var i=this.root.replace(C,"");if(!t.indexOf(i))t=t.substr(i.length)}else{t=this.getHash()}}return t.replace(N,"")},start:function(t){if(I.started)throw new Error("Backbone.history has already been started");I.started=true;this.options=h.extend({},{root:"/"},this.options,t);this.root=this.options.root;this._wantsHashChange=this.options.hashChange!==false;this._wantsPushState=!!this.options.pushState;this._hasPushState=!!(this.options.pushState&&this.history&&this.history.pushState);var e=this.getFragment();var i=document.documentMode;var r=O.exec(navigator.userAgent.toLowerCase())&&(!i||i<=7);this.root=("/"+this.root+"/").replace(P,"/");if(r&&this._wantsHashChange){this.iframe=a.$('<iframe src="javascript:0" tabindex="-1" />').hide().appendTo("body")[0].contentWindow;this.navigate(e)}if(this._hasPushState){a.$(window).on("popstate",this.checkUrl)}else if(this._wantsHashChange&&"onhashchange"in window&&!r){a.$(window).on("hashchange",this.checkUrl)}else if(this._wantsHashChange){this._checkUrlInterval=setInterval(this.checkUrl,this.interval)}this.fragment=e;var s=this.location;var n=s.pathname.replace(/[^\/]$/,"$&/")===this.root;if(this._wantsHashChange&&this._wantsPushState&&!this._hasPushState&&!n){this.fragment=this.getFragment(null,true);this.location.replace(this.root+this.location.search+"#"+this.fragment);return true}else if(this._wantsPushState&&this._hasPushState&&n&&s.hash){this.fragment=this.getHash().replace(N,"");this.history.replaceState({},document.title,this.root+this.fragment+s.search)}if(!this.options.silent)return this.loadUrl()},stop:function(){a.$(window).off("popstate",this.checkUrl).off("hashchange",this.checkUrl);clearInterval(this._checkUrlInterval);I.started=false},route:function(t,e){this.handlers.unshift({route:t,callback:e})},checkUrl:function(t){var e=this.getFragment();if(e===this.fragment&&this.iframe){e=this.getFragment(this.getHash(this.iframe))}if(e===this.fragment)return false;if(this.iframe)this.navigate(e);this.loadUrl()||this.loadUrl(this.getHash())},loadUrl:function(t){var e=this.fragment=this.getFragment(t);var i=h.any(this.handlers,function(t){if(t.route.test(e)){t.callback(e);return true}});return i},navigate:function(t,e){if(!I.started)return false;if(!e||e===true)e={trigger:e};t=this.getFragment(t||"");if(this.fragment===t)return;this.fragment=t;var i=this.root+t;if(this._hasPushState){this.history[e.replace?"replaceState":"pushState"]({},document.title,i)}else if(this._wantsHashChange){this._updateHash(this.location,t,e.replace);if(this.iframe&&t!==this.getFragment(this.getHash(this.iframe))){if(!e.replace)this.iframe.document.open().close();this._updateHash(this.iframe.location,t,e.replace)}}else{return this.location.assign(i)}if(e.trigger)this.loadUrl(t)},_updateHash:function(t,e,i){if(i){var r=t.href.replace(/(javascript:|#).*$/,"");t.replace(r+"#"+e)}else{t.hash="#"+e}}});a.history=new I;var j=function(t,e){var i=this;var r;if(t&&h.has(t,"constructor")){r=t.constructor}else{r=function(){return i.apply(this,arguments)}}h.extend(r,i,e);var s=function(){this.constructor=r};s.prototype=i.prototype;r.prototype=new s;if(t)h.extend(r.prototype,t);r.__super__=i.prototype;return r};d.extend=g.extend=S.extend=b.extend=I.extend=j;var U=function(){throw new Error('A "url" property or function must be specified')};var R=function(t,e){var i=e.error;e.error=function(r){if(i)i(t,r,e);t.trigger("error",t,r,e)}}}).call(this);
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c,d=-1,e=a.length,f=b[0],g=b[1],h=b[2];switch(b.length){case 0:for(;++d<e;)(c=a[d]).callback.call(c.ctx);return;case 1:for(;++d<e;)(c=a[d]).callback.call(c.ctx,f);return;case 2:for(;++d<e;)(c=a[d]).callback.call(c.ctx,f,g);return;case 3:for(;++d<e;)(c=a[d]).callback.call(c.ctx,f,g,h);return;default:for(;++d<e;)(c=a[d]).callback.apply(c.ctx,b)}},k={listenTo:"on",listenToOnce:"once"};f.each(k,function(a,b){g[b]=function(b,c,d){var e=this._listeningTo||(this._listeningTo={}),g=b._listenId||(b._listenId=f.uniqueId("l"));return e[g]=b,d||"object"!=typeof c||(d=this),b[a](c,d,this),this}}),g.bind=g.on,g.unbind=g.off,f.extend(a,g);var l=a.Model=function(a,b){var c=a||{};b||(b={}),this.cid=f.uniqueId("c"),this.attributes={},b.collection&&(this.collection=b.collection),b.parse&&(c=this.parse(c,b)||{}),c=f.defaults({},c,f.result(this,"defaults")),this.set(c,b),this.changed={},this.initialize.apply(this,arguments)};f.extend(l.prototype,g,{changed:null,validationError:null,idAttribute:"id",initialize:function(){},toJSON:function(){return f.clone(this.attributes)},sync:function(){return a.sync.apply(this,arguments)},get:function(a){return this.attributes[a]},escape:function(a){return f.escape(this.get(a))},has:function(a){return null!=this.get(a)},set:function(a,b,c){var d,e,g,h,i,j,k,l;if(null==a)return this;if("object"==typeof a?(e=a,c=b):(e={})[a]=b,c||(c={}),!this._validate(e,c))return!1;g=c.unset,i=c.silent,h=[],j=this._changing,this._changing=!0,j||(this._previousAttributes=f.clone(this.attributes),this.changed={}),l=this.attributes,k=this._previousAttributes,this.idAttribute in e&&(this.id=e[this.idAttribute]);for(d in e)b=e[d],f.isEqual(l[d],b)||h.push(d),f.isEqual(k[d],b)?delete this.changed[d]:this.changed[d]=b,g?delete l[d]:l[d]=b;if(!i){h.length&&(this._pending=!0);for(var m=0,n=h.length;n>m;m++)this.trigger("change:"+h[m],this,l[h[m]],c)}if(j)return this;if(!i)for(;this._pending;)this._pending=!1,this.trigger("change",this,c);return this._pending=!1,this._changing=!1,this},unset:function(a,b){return this.set(a,void 0,f.extend({},b,{unset:!0}))},clear:function(a){var b={};for(var c in this.attributes)b[c]=void 0;return this.set(b,f.extend({},a,{unset:!0}))},hasChanged:function(a){return null==a?!f.isEmpty(this.changed):f.has(this.changed,a)},changedAttributes:function(a){if(!a)return this.hasChanged()?f.clone(this.changed):!1;var b,c=!1,d=this._changing?this._previousAttributes:this.attributes;for(var e in a)f.isEqual(d[e],b=a[e])||((c||(c={}))[e]=b);return c},previous:function(a){return null!=a&&this._previousAttributes?this._previousAttributes[a]:null},previousAttributes:function(){return f.clone(this._previousAttributes)},fetch:function(a){a=a?f.clone(a):{},void 0===a.parse&&(a.parse=!0);var b=this,c=a.success;return a.success=function(d){return b.set(b.parse(d,a),a)?(c&&c(b,d,a),void b.trigger("sync",b,d,a)):!1},K(this,a),this.sync("read",this,a)},save:function(a,b,c){var d,e,g,h=this.attributes;if(null==a||"object"==typeof a?(d=a,c=b):(d={})[a]=b,c=f.extend({validate:!0},c),d&&!c.wait){if(!this.set(d,c))return!1}else if(!this._validate(d,c))return!1;d&&c.wait&&(this.attributes=f.extend({},h,d)),void 0===c.parse&&(c.parse=!0);var i=this,j=c.success;return c.success=function(a){i.attributes=h;var b=i.parse(a,c);return c.wait&&(b=f.extend(d||{},b)),f.isObject(b)&&!i.set(b,c)?!1:(j&&j(i,a,c),void i.trigger("sync",i,a,c))},K(this,c),e=this.isNew()?"create":c.patch?"patch":"update","patch"===e&&(c.attrs=d),g=this.sync(e,this,c),d&&c.wait&&(this.attributes=h),g},destroy:function(a){a=a?f.clone(a):{};var b=this,c=a.success,d=function(){b.trigger("destroy",b,b.collection,a)};if(a.success=function(e){(a.wait||b.isNew())&&d(),c&&c(b,e,a),b.isNew()||b.trigger("sync",b,e,a)},this.isNew())return a.success(),!1;K(this,a);var e=this.sync("delete",this,a);return a.wait||d(),e},url:function(){var a=f.result(this,"urlRoot")||f.result(this.collection,"url")||J();return this.isNew()?a:a+("/"===a.charAt(a.length-1)?"":"/")+encodeURIComponent(this.id)},parse:function(a){return a},clone:function(){return new this.constructor(this.attributes)},isNew:function(){return null==this.id},isValid:function(a){return this._validate({},f.extend(a||{},{validate:!0}))},_validate:function(a,b){if(!b.validate||!this.validate)return!0;a=f.extend({},this.attributes,a);var c=this.validationError=this.validate(a,b)||null;return c?(this.trigger("invalid",this,c,f.extend(b,{validationError:c})),!1):!0}});var m=["keys","values","pairs","invert","pick","omit"];f.each(m,function(a){l.prototype[a]=function(){var b=e.call(arguments);return b.unshift(this.attributes),f[a].apply(f,b)}});var n=a.Collection=function(a,b){b||(b={}),b.model&&(this.model=b.model),void 0!==b.comparator&&(this.comparator=b.comparator),this._reset(),this.initialize.apply(this,arguments),a&&this.reset(a,f.extend({silent:!0},b))},o={add:!0,remove:!0,merge:!0},p={add:!0,remove:!1};f.extend(n.prototype,g,{model:l,initialize:function(){},toJSON:function(a){return this.map(function(b){return b.toJSON(a)})},sync:function(){return a.sync.apply(this,arguments)},add:function(a,b){return this.set(a,f.extend({merge:!1},b,p))},remove:function(a,b){var c=!f.isArray(a);a=c?[a]:f.clone(a),b||(b={});var d,e,g,h;for(d=0,e=a.length;e>d;d++)h=a[d]=this.get(a[d]),h&&(delete this._byId[h.id],delete this._byId[h.cid],g=this.indexOf(h),this.models.splice(g,1),this.length--,b.silent||(b.index=g,h.trigger("remove",h,this,b)),this._removeReference(h));return c?a[0]:a},set:function(a,b){b=f.defaults({},b,o),b.parse&&(a=this.parse(a,b));var c=!f.isArray(a);a=c?a?[a]:[]:f.clone(a);var d,e,g,h,i,j,k,m=b.at,n=this.model,p=this.comparator&&null==m&&b.sort!==!1,q=f.isString(this.comparator)?this.comparator:null,r=[],s=[],t={},u=b.add,v=b.merge,w=b.remove,x=!p&&u&&w?[]:!1;for(d=0,e=a.length;e>d;d++){if(i=a[d],g=i instanceof l?h=i:i[n.prototype.idAttribute],j=this.get(g))w&&(t[j.cid]=!0),v&&(i=i===h?h.attributes:i,b.parse&&(i=j.parse(i,b)),j.set(i,b),p&&!k&&j.hasChanged(q)&&(k=!0)),a[d]=j;else if(u){if(h=a[d]=this._prepareModel(i,b),!h)continue;r.push(h),h.on("all",this._onModelEvent,this),this._byId[h.cid]=h,null!=h.id&&(this._byId[h.id]=h)}x&&x.push(j||h)}if(w){for(d=0,e=this.length;e>d;++d)t[(h=this.models[d]).cid]||s.push(h);s.length&&this.remove(s,b)}if(r.length||x&&x.length)if(p&&(k=!0),this.length+=r.length,null!=m)for(d=0,e=r.length;e>d;d++)this.models.splice(m+d,0,r[d]);else{x&&(this.models.length=0);var y=x||r;for(d=0,e=y.length;e>d;d++)this.models.push(y[d])}if(k&&this.sort({silent:!0}),!b.silent){for(d=0,e=r.length;e>d;d++)(h=r[d]).trigger("add",h,this,b);(k||x&&x.length)&&this.trigger("sort",this,b)}return c?a[0]:a},reset:function(a,b){b||(b={});for(var c=0,d=this.models.length;d>c;c++)this._removeReference(this.models[c]);return b.previousModels=this.models,this._reset(),a=this.add(a,f.extend({silent:!0},b)),b.silent||this.trigger("reset",this,b),a},push:function(a,b){return this.add(a,f.extend({at:this.length},b))},pop:function(a){var b=this.at(this.length-1);return this.remove(b,a),b},unshift:function(a,b){return this.add(a,f.extend({at:0},b))},shift:function(a){var b=this.at(0);return this.remove(b,a),b},slice:function(){return e.apply(this.models,arguments)},get:function(a){return null==a?void 0:this._byId[a.id]||this._byId[a.cid]||this._byId[a]},at:function(a){return this.models[a]},where:function(a,b){return f.isEmpty(a)?b?void 0:[]:this[b?"find":"filter"](function(b){for(var c in a)if(a[c]!==b.get(c))return!1;return!0})},findWhere:function(a){return this.where(a,!0)},sort:function(a){if(!this.comparator)throw new Error("Cannot sort a set without a comparator");return a||(a={}),f.isString(this.comparator)||1===this.comparator.length?this.models=this.sortBy(this.comparator,this):this.models.sort(f.bind(this.comparator,this)),a.silent||this.trigger("sort",this,a),this},pluck:function(a){return f.invoke(this.models,"get",a)},fetch:function(a){a=a?f.clone(a):{},void 0===a.parse&&(a.parse=!0);var b=a.success,c=this;return a.success=function(d){var e=a.reset?"reset":"set";c[e](d,a),b&&b(c,d,a),c.trigger("sync",c,d,a)},K(this,a),this.sync("read",this,a)},create:function(a,b){if(b=b?f.clone(b):{},!(a=this._prepareModel(a,b)))return!1;b.wait||this.add(a,b);var c=this,d=b.success;return b.success=function(a,b,e){e.wait&&c.add(a,e),d&&d(a,b,e)},a.save(null,b),a},parse:function(a){return a},clone:function(){return new 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q=["forEach","each","map","collect","reduce","foldl","inject","reduceRight","foldr","find","detect","filter","select","reject","every","all","some","any","include","contains","invoke","max","min","toArray","size","first","head","take","initial","rest","tail","drop","last","without","difference","indexOf","shuffle","lastIndexOf","isEmpty","chain"];f.each(q,function(a){n.prototype[a]=function(){var b=e.call(arguments);return b.unshift(this.models),f[a].apply(f,b)}});var r=["groupBy","countBy","sortBy"];f.each(r,function(a){n.prototype[a]=function(b,c){var d=f.isFunction(b)?b:function(a){return a.get(b)};return f[a](this.models,d,c)}});var s=a.View=function(a){this.cid=f.uniqueId("view"),a||(a={}),f.extend(this,f.pick(a,u)),this._ensureElement(),this.initialize.apply(this,arguments),this.delegateEvents()},t=/^(\S+)\s*(.*)$/,u=["model","collection","el","id","attributes","className","tagName","events"];f.extend(s.prototype,g,{tagName:"div",$:function(a){return this.$el.find(a)},initialize:function(){},render:function(){return this},remove:function(){return this.$el.remove(),this.stopListening(),this},setElement:function(b,c){return this.$el&&this.undelegateEvents(),this.$el=b instanceof a.$?b:a.$(b),this.el=this.$el[0],c!==!1&&this.delegateEvents(),this},delegateEvents:function(a){if(!a&&!(a=f.result(this,"events")))return this;this.undelegateEvents();for(var b in a){var c=a[b];if(f.isFunction(c)||(c=this[a[b]]),c){var d=b.match(t),e=d[1],g=d[2];c=f.bind(c,this),e+=".delegateEvents"+this.cid,""===g?this.$el.on(e,c):this.$el.on(e,g,c)}}return this},undelegateEvents:function(){return this.$el.off(".delegateEvents"+this.cid),this},_ensureElement:function(){if(this.el)this.setElement(f.result(this,"el"),!1);else{var b=f.extend({},f.result(this,"attributes"));this.id&&(b.id=f.result(this,"id")),this.className&&(b["class"]=f.result(this,"className"));var c=a.$("<"+f.result(this,"tagName")+">").attr(b);this.setElement(c,!1)}}}),a.sync=function(b,c,d){var e=w[b];f.defaults(d||(d={}),{emulateHTTP:a.emulateHTTP,emulateJSON:a.emulateJSON});var g={type:e,dataType:"json"};if(d.url||(g.url=f.result(c,"url")||J()),null!=d.data||!c||"create"!==b&&"update"!==b&&"patch"!==b||(g.contentType="application/json",g.data=JSON.stringify(d.attrs||c.toJSON(d))),d.emulateJSON&&(g.contentType="application/x-www-form-urlencoded",g.data=g.data?{model:g.data}:{}),d.emulateHTTP&&("PUT"===e||"DELETE"===e||"PATCH"===e)){g.type="POST",d.emulateJSON&&(g.data._method=e);var h=d.beforeSend;d.beforeSend=function(a){return a.setRequestHeader("X-HTTP-Method-Override",e),h?h.apply(this,arguments):void 0}}"GET"===g.type||d.emulateJSON||(g.processData=!1),"PATCH"===g.type&&v&&(g.xhr=function(){return new ActiveXObject("Microsoft.XMLHTTP")});var i=d.xhr=a.ajax(f.extend(g,d));return c.trigger("request",c,i,d),i};var v=!("undefined"==typeof window||!window.ActiveXObject||window.XMLHttpRequest&&(new XMLHttpRequest).dispatchEvent),w={create:"POST",update:"PUT",patch:"PATCH","delete":"DELETE",read:"GET"};a.ajax=function(){return a.$.ajax.apply(a.$,arguments)};var x=a.Router=function(a){a||(a={}),a.routes&&(this.routes=a.routes),this._bindRoutes(),this.initialize.apply(this,arguments)},y=/\((.*?)\)/g,z=/(\(\?)?:\w+/g,A=/\*\w+/g,B=/[\-{}\[\]+?.,\\\^$|#\s]/g;f.extend(x.prototype,g,{initialize:function(){},route:function(b,c,d){f.isRegExp(b)||(b=this._routeToRegExp(b)),f.isFunction(c)&&(d=c,c=""),d||(d=this[c]);var e=this;return a.history.route(b,function(f){var g=e._extractParameters(b,f);d&&d.apply(e,g),e.trigger.apply(e,["route:"+c].concat(g)),e.trigger("route",c,g),a.history.trigger("route",e,c,g)}),this},navigate:function(b,c){return a.history.navigate(b,c),this},_bindRoutes:function(){if(this.routes){this.routes=f.result(this,"routes");for(var a,b=f.keys(this.routes);null!=(a=b.pop());)this.route(a,this.routes[a])}},_routeToRegExp:function(a){return a=a.replace(B,"\\$&").replace(y,"(?:$1)?").replace(z,function(a,b){return b?a:"([^/]+)"}).replace(A,"(.*?)"),new RegExp("^"+a+"$")},_extractParameters:function(a,b){var c=a.exec(b).slice(1);return f.map(c,function(a){return a?decodeURIComponent(a):null})}});var C=a.History=function(){this.handlers=[],f.bindAll(this,"checkUrl"),"undefined"!=typeof window&&(this.location=window.location,this.history=window.history)},D=/^[#\/]|\s+$/g,E=/^\/+|\/+$/g,F=/msie [\w.]+/,G=/\/$/,H=/[?#].*$/;C.started=!1,f.extend(C.prototype,g,{interval:50,getHash:function(a){var b=(a||this).location.href.match(/#(.*)$/);return b?b[1]:""},getFragment:function(a,b){if(null==a)if(this._hasPushState||!this._wantsHashChange||b){a=this.location.pathname;var c=this.root.replace(G,"");a.indexOf(c)||(a=a.slice(c.length))}else a=this.getHash();return a.replace(D,"")},start:function(b){if(C.started)throw new 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diff --git a/wp-includes/js/underscore.min.js b/wp-includes/js/underscore.min.js
index 88d63a5b46..5c6742f7a8 100644
--- a/wp-includes/js/underscore.min.js
+++ b/wp-includes/js/underscore.min.js
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diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index 6e4488d16a..9fd2911406 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -50,8 +50,11 @@ require( ABSPATH . WPINC . '/functions.wp-styles.php' );
 function wp_default_scripts( &$scripts ) {
 	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
 
-	if ( ! defined( 'SCRIPT_DEBUG' ) )
-		define( 'SCRIPT_DEBUG', false !== strpos( $wp_version, '-src' ) );
+	$develop_src = false !== strpos( $wp_version, '-src' );
+
+	if ( ! defined( 'SCRIPT_DEBUG' ) ) {
+		define( 'SCRIPT_DEBUG', $develop_src );
+	}
 
 	if ( ! $guessurl = site_url() ) {
 		$guessed_url = true;
@@ -64,6 +67,7 @@ function wp_default_scripts( &$scripts ) {
 	$scripts->default_dirs = array('/wp-admin/js/', '/wp-includes/js/');
 
 	$suffix = SCRIPT_DEBUG ? '' : '.min';
+	$dev_suffix = $develop_src ? '' : '.min';
 
 	$scripts->add( 'utils', "/wp-includes/js/utils$suffix.js" );
 	did_action( 'init' ) && $scripts->localize( 'utils', 'userSettings', array(
@@ -270,8 +274,8 @@ function wp_default_scripts( &$scripts ) {
 
 	$scripts->add( 'json2', "/wp-includes/js/json2$suffix.js", array(), '2011-02-23');
 
-	$scripts->add( 'underscore', '/wp-includes/js/underscore.min.js', array(), '1.4.4', 1 );
-	$scripts->add( 'backbone', '/wp-includes/js/backbone.min.js', array('underscore','jquery'), '1.0.0', 1 );
+	$scripts->add( 'underscore', "/wp-includes/js/underscore$dev_suffix.js", array(), '1.6.0', 1 );
+	$scripts->add( 'backbone', "/wp-includes/js/backbone$dev_suffix.js", array( 'underscore','jquery' ), '1.1.0', 1 );
 
 	$scripts->add( 'wp-util', "/wp-includes/js/wp-util$suffix.js", array('underscore', 'jquery'), false, 1 );
 	did_action( 'init' ) && $scripts->localize( 'wp-util', '_wpUtilSettings', array(