Fixes some Ember Deprecations for 1.13:

- Remove ArrayController
- Remove {{view}} from templates
- Replace many cases of needs: [‘controller’] with inject
- Enable Ember Legacy Views

app/assets/javascripts/admin/controllers/admin-plugins.js.es6

@@ -1,10 +1,9 @@
-export default Ember.ArrayController.extend({
-
+export default Ember.Controller.extend({
   adminRoutes: function() {
-    return this.get('model').map(function(p) {
-        if (p.get('enabled')) {
-          return p.admin_route;
-        }
+    return this.get('model').map(p => {
+      if (p.get('enabled')) {
+        return p.admin_route;
+      }
     }).compact();
   }.property()
 });