New hook for after the application route has activated

app/assets/javascripts/discourse/routes/application_route.js

@@ -80,8 +80,16 @@ Discourse.ApplicationRoute = Em.Route.extend({
         });
       }
 
-    }
-
-  }
+    },
+  },
 
+  activate: function() {
+    this._super();
+    Em.run.next(function() { 
+      // Support for callbacks once the application has activated
+      Discourse.ApplicationRoute.trigger('activate');
     });
+  }
+});
+
+RSVP.EventTarget.mixin(Discourse.ApplicationRoute);