Revert "Revert Ember 2.10+ for a short while"

This reverts commit 21682fd60b.

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 "admin-menu" tagName="li"}}
+        {{plugin-outlet name="admin-menu" connectorTagName="li"}}
       </ul>
 
       <div class='boxed white admin-content'>

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

@@ -1,4 +1,4 @@
-{{plugin-outlet "admin-dashboard-top"}}
+{{plugin-outlet name="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 "group-email-in"}}
+      {{plugin-outlet name="group-email-in" args=(hash model=model)}}
     {{/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 'upgrade-header'}}
+      {{custom-html name="upgrade-header"}}
       <tr>
         <th>&nbsp;</th>
         <th>{{i18n 'admin.dashboard.installed_version'}}</th>