refactor umb editor menu directive to follow angular style guide

src/Umbraco.Web.UI.Client/src/common/directives/components/editor/umbeditormenu.directive.js

@@ -1,13 +1,22 @@
-angular.module("umbraco.directives.html")
-.directive('umbEditorMenu', function () {
-    return {
-       scope: {
-        menu: "=",
-        dimmed: "="
-    },
-    transclude: true,
-    restrict: 'E',
-    replace: true,        
-    templateUrl: 'views/components/navigation/umb-editor-menu.html'
-};
-});
+(function() {
+   'use strict';
+
+   function EditorMenuDirective() {
+
+      var directive = {
+         transclude: true,
+         restrict: 'E',
+         replace: true,
+         templateUrl: 'views/components/navigation/umb-editor-menu.html',
+         scope: {
+            menu: "=",
+            dimmed: "="
+         }
+      };
+
+      return directive;
+   }
+
+   angular.module('umbraco.directives').directive('umbEditorMenu', EditorMenuDirective);
+
+})();