code: function offEvent(gesture, handler) {
      var gestures = gesture.split(' ')
        , i, eh;
      Utils.each(gestures, function(gesture) {
        this.element.removeEventListener(gesture, handler, false);
  
        // remove the event handler from the internal list
        for(i=-1; (eh=this.eventHandlers[++i]);) {
          if(eh.gesture === gesture && eh.handler === handler) {
            this.eventHandlers.splice(i, 1);
          }
        }
      }, this);
      return this;
    }
docs: unbind events to the instance
  @param   {String}      gesture
  @param   {Function}    handler
  @returns {Hammer.Instance}