refactor(menu): removed deprecated $mdOpenMenu API

- fixed test that used this old API

BREAKING CHANGE: Removed the deprecated `$mdOpenMenu` API. It was deprecated in favor of `$mdMenu.open`.

Author: Splaktar

src/components/menu/js/menuController.js

@@ -238,10 +238,4 @@ function MenuController($mdMenu, $attrs, $element, $scope, $mdUtil, $timeout, $r
     open: this.open,
     close: this.close
   };
-
-  // Deprecated APIs
-  $scope.$mdOpenMenu = angular.bind(this, function() {
-    $log.warn('mdMenu: The $mdOpenMenu method is deprecated. Please use `$mdMenu.open`.');
-    return this.open.apply(this, arguments);
-  });
 }

src/components/menu/menu.spec.js

@@ -198,7 +198,7 @@ describe('material.components.menu', function() {
       it('should focus on first item automatically', inject(function($compile, $rootScope, $document) {
         var menu = $compile(
           '<md-menu>' +
-            '<button ng-click="$mdOpenMenu($event)">Hello World</button>' +
+            '<button ng-click="$mdMenu.open($event)">Hello World</button>' +
             '<md-menu-content>' +
               '<md-menu-item>' +
                 '<button id="menuItem0" ng-click="doSomething($event)"></button>' +
@@ -220,7 +220,7 @@ describe('material.components.menu', function() {
       it('should focus on first non-disabled item', inject(function($compile, $rootScope, $document) {
         var menu = $compile(
           '<md-menu>' +
-            '<button ng-click="$mdOpenMenu($event)">Hello World</button>' +
+            '<button ng-click="$mdMenu.open($event)">Hello World</button>' +
             '<md-menu-content>' +
               '<md-menu-item>' +
                 '<button disabled ng-click="doSomething($event)"></button>' +