code: function dispose() {
      var i, eh;
  
      // undo all changes made by stop_browser_behavior
      if(this.options.stop_browser_behavior) {
        Utils.toggleDefaultBehavior(this.element, this.options.stop_browser_behavior, true);
      }
  
      // unbind all custom event handlers
      for(i=-1; (eh=this.eventHandlers[++i]);) {
        this.element.removeEventListener(eh.gesture, eh.handler, false);
      }
      this.eventHandlers = [];
  
      // unbind the start event listener
      Event.unbindDom(this.element, Hammer.EVENT_TYPES[EVENT_START], this.eventStartHandler);
  
      return null;
    }
docs: dispose this hammer instance
  @returns {Hammer.Instance}