Upgrade JSHint. Fixes linting issues.

app/assets/javascripts/discourse.js

@@ -1,5 +1,3 @@
-/*global Modernizr:true*/
-/*global assetPath:true*/
 /*global Favcount:true*/
 
 /**
@@ -8,7 +6,7 @@
   @class Discourse
   @extends Ember.Application
 **/
-Discourse = Ember.Application.createWithMixins(Discourse.Ajax, {
+window.Discourse = Ember.Application.createWithMixins(Discourse.Ajax, {
   rootElement: '#main',
 
   // Helps with integration tests

app/assets/javascripts/discourse/lib/formatter.js

@@ -1,5 +1,3 @@
-/*jshint onecase:true */
-
 Discourse.Formatter = (function(){
 
   var updateRelativeAge, autoUpdatingRelativeAge, relativeAge, relativeAgeTiny,

app/assets/javascripts/discourse/views/composer/composer_view.js

@@ -1,4 +1,4 @@
-/*global Markdown:true assetPath:true */
+/*global assetPath:true */
 
 /**
   This view handles rendering of the composer

app/assets/javascripts/discourse/views/pagedown_editor.js

@@ -1,4 +1,4 @@
-/*global Markdown:true assetPath:true */
+/*global assetPath:true */
 
 /**
   A control to support using PageDown as an Ember view.

app/assets/javascripts/preload_store.js

@@ -5,7 +5,7 @@
 
   @class PreloadStore
 **/
-PreloadStore = {
+window.PreloadStore = {
   data: {},
 
   /**