Neatly using hammer2 for the delete button

lib/timeline/component/item/Item.js

@@ -137,16 +137,12 @@ Item.prototype._repaintDeleteButton = function (anchor) {
     deleteButton.className = 'delete';
     deleteButton.title = 'Delete this item';
 
-    // TODO: neatly handle button click
+    // TODO: be able to destroy the delete button
     new Hammer(deleteButton).on('tap', function (event) {
       me.parent.removeFromDataSet(me);
-      event.srcEvent.stopPropagation(); // TODO: stopPropagation seems not to work
+      event.stopPropagation();
+      event.preventDefault();
     });
-    //deleteButton.addEventListener('click', function (event) {
-    //  me.parent.removeFromDataSet(me);
-    //  event.stopPropagation();
-    //  event.preventDefault();
-    //});
 
     anchor.appendChild(deleteButton);
     this.dom.deleteButton = deleteButton;