update elements and fix some bugs

lib/src/paper-dialog-behavior/paper-dialog-behavior.html

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@@ skipping 86 matching lines @@
       _boundOnBackdropClick: {
         type: Function,
         value: function() {
           return this._onBackdropClick.bind(this);
         }
       }
 
     },
 
     listeners: {
-      'click': '_onDialogClick',
+      'tap': '_onDialogClick',
       'iron-overlay-opened': '_onIronOverlayOpened',
       'iron-overlay-closed': '_onIronOverlayClosed'
     },
 
     attached: function() {
       this._observer = this._observe(this);
       this._updateAriaLabelledBy();
     },
 
     detached: function() {
@@ skipping 112 matching lines @@
         }
       }
     }
 
   };
 
   /** @polymerBehavior */
   Polymer.PaperDialogBehavior = [Polymer.IronOverlayBehavior, Polymer.PaperDialogBehaviorImpl];
 
 </script>