FEATURE: add .admin-interface class to BODY when in admin

removes some dead code as well

app/assets/javascripts/admin/components/admin-wrapper.js.es6

@@ -0,0 +1,11 @@
+export default Ember.Component.extend({
+  didInsertElement() {
+    this._super();
+    $('body').addClass('admin-interface');
+  },
+
+  willDestroyElement() {
+    this._super();
+    $('body').removeClass('admin-interface');
+  }
+});

app/assets/javascripts/admin/components/disable-custom-stylesheets.js.es6

@@ -1,14 +0,0 @@
-export default Ember.Component.extend({
-  willInsertElement() {
-    this._super();
-    if (this.session.get("disableCustomCSS")) {
-      $("link.custom-css").attr("rel", "");
-      this.session.set("disableCustomCSS", false);
-    }
-  },
-
-  willDestroyElement() {
-    this._super();
-    $("link.custom-css").attr("rel", "stylesheet");
-  }
-});

app/assets/javascripts/admin/templates/admin.hbs

@@ -1,4 +1,4 @@
-{{#disable-custom-stylesheets class="container"}}
+{{#admin-wrapper class="container"}}
   <div class="row">
     <div class="full-width">
 
@@ -34,4 +34,4 @@
 
     </div>
   </div>
-{{/disable-custom-stylesheets}}
+{{/admin-wrapper}}

app/assets/javascripts/discourse/initializers/live-development.js.es6

@@ -7,22 +7,6 @@ export default {
   initialize(container) {
     const messageBus = container.lookup('message-bus:main');
 
-    // subscribe to any site customizations that are loaded
-    $('link.custom-css').each(function() {
-      const split = this.href.split("/"),
-          id = split[split.length - 1].split(".css")[0],
-          self = this;
-
-      return messageBus.subscribe("/file-change/" + id, function(data) {
-        if (!$(self).data('orig')) {
-          $(self).data('orig', self.href);
-        }
-        const orig = $(self).data('orig');
-
-        self.href = orig.replace(/v=.*/, "v=" + data);
-      });
-    });
-
     // Custom header changes
     $('header.custom').each(function() {
       const header = $(this);