Revert "Revert "Revert Ember 2.10+ for a short while""

This reverts commit 76bbc481cb.

app/assets/javascripts/admin/components/ace-editor.js.es6

@@ -36,7 +36,6 @@ export default Ember.Component.extend({
 
     loadScript("/javascripts/ace/ace.js", { scriptTag: true }).then(() => {
       window.ace.require(['ace/ace'], loadedAce => {
-        if (!this.element || this.isDestroying || this.isDestroyed) { return; }
         const editor = loadedAce.edit(this.$('.ace')[0]);
 
         editor.setTheme("ace/theme/chrome");

app/assets/javascripts/admin/controllers/admin-badges-show.js.es6

@@ -68,7 +68,7 @@ export default Ember.Controller.extend(BufferedContent, {
         this.get('model').save(data).then(() => {
           if (newBadge) {
             const adminBadges = this.get('adminBadges.model');
-            if (!adminBadges.includes(model)) {
+            if (!adminBadges.contains(model)) {
               adminBadges.pushObject(model);
             }
             this.transitionToRoute('adminBadges.show', model.get('id'));

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

@@ -23,7 +23,7 @@
           {{nav-item route='admin.backups' label='admin.backups.title'}}
         {{/if}}
         {{nav-item route='adminPlugins' label='admin.plugins.title'}}
-        {{plugin-outlet name="admin-menu" connectorTagName="li"}}
+        {{plugin-outlet "admin-menu" tagName="li"}}
       </ul>
 
       <div class='boxed white admin-content'>

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

@@ -1,4 +1,4 @@
-{{plugin-outlet name="admin-dashboard-top"}}
+{{plugin-outlet "admin-dashboard-top"}}
 
 {{#conditional-loading-spinner condition=loading}}
   <div class="dashboard-left">

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

@@ -108,7 +108,7 @@
     {{#if siteSettings.email_in}}
         <label for="incoming_email">{{i18n 'admin.groups.incoming_email'}}</label>
         {{text-field name="incoming_email" value=model.incoming_email placeholderKey="admin.groups.incoming_email_placeholder"}}
-      {{plugin-outlet name="group-email-in" args=(hash model=model)}}
+      {{plugin-outlet "group-email-in"}}
     {{/if}}
   {{/unless}}
 

app/assets/javascripts/admin/templates/version-checks.hbs

@@ -1,7 +1,7 @@
 <div class="dashboard-stats version-check {{if versionCheck.critical_updates 'critical' 'normal'}}">
   <table class="table table-condensed table-hover">
     <thead>
-      {{custom-html name="upgrade-header"}}
+      {{custom-html 'upgrade-header'}}
       <tr>
         <th>&nbsp;</th>
         <th>{{i18n 'admin.dashboard.installed_version'}}</th>