Fix click and doubleclick events on items (#2988)

* Fix redraw order

* Fix error when option is not defined

* Allow template labels

* Add .travis.yml file

* Add experiment travis code

* Fix react example

* Fix item click and doubleclick

* Remove new empty line

* Return id of item tapped

* Fix comments from Review

* Add missing semicolon

lib/timeline/component/item/Item.js

@@ -146,15 +146,25 @@ Item.prototype.repositionY = function() {
 Item.prototype._repaintDragCenter = function () {
   if (this.selected && this.options.editable.updateTime && !this.dom.dragCenter) {
     var me = this;
-
     // create and show drag area
     var dragCenter = document.createElement('div');
     dragCenter.className = 'vis-drag-center';
     dragCenter.dragCenterItem = this;
+    var hammer = new Hammer(dragCenter);
 
-    new Hammer(dragCenter).on('doubletap', function (event) {
+    hammer.on('tap', function (event) {
+      me.parent.itemSet.body.emitter.emit('click',  {
+        event: event,
+        item: me.id
+      });
+    });
+    hammer.on('doubletap', function (event) {
       event.stopPropagation();
       me.parent.itemSet._onUpdateItem(me);
+      me.parent.itemSet.body.emitter.emit('doubleClick', {
+        event: event,
+        item: me.id 
+      });
     });
 
     if (this.dom.box) {
@@ -370,7 +380,6 @@ Item.prototype._updateContents = function (element) {
           throw new Error('Property "content" missing in item ' + this.id);
         }
       }
-
       this.content = content;
     }
   }