Angular在directive裏調用mdDialog組建

按照如下方式添加：

angular.module('XXXXXXXX', [])
  .directive('XXXXXXXX', ['$mdDialog', function ($mdDialog) {
    return {
      restrict: 'E',
      scope: {
         ............
      },
      templateUrl: './static/templates/directives/XXXXXXXX.html',
      link: function ($scope, element, attrs) {
         ............
      }
    };
  }]);