Convert admin section controllers to ES6 modules

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

@@ -0,0 +1,13 @@
+/**
+  A base admin controller that has access to the Discourse properties.
+
+  @class AdminController
+  @extends Discourse.Controller
+  @namespace Discourse
+  @module Discourse
+**/
+export default Discourse.Controller.extend({
+  showBadges: function() {
+    return this.get('currentUser.admin') && Discourse.SiteSettings.enable_badges;
+  }.property()
+});