code: function logHammerEvent(ev) {
  		if(!ev.gesture) {
  			return;
  		}
  
  		// store last event, that should might match the gremlin
  		if(ev.gesture.eventType == 'end') {
  			testLogger.lastEvent = ev;
  		}
  
  		// highlight gesture
  		var event_el = getLogElement('gesture', ev.type);
  		event_el.className = 'active';
  
  		for(var i = 0, len = hammerProps.length; i < len; i++) {
  			var prop = hammerProps[i];
  			var value = ev.gesture[prop];
  			switch(prop) {
  				case 'center':
  					value = value.pageX + 'x' + value.pageY;
  					break;
  				case 'gesture':
  					value = ev.type;
  					break;
  				case 'target':
  					value = ev.gesture.target.tagName;
  					break;
  				case 'touches':
  					value = ev.gesture.touches.length;
  					break;
  			}
  			getLogElement('prop', prop).innerHTML = value;
  		}
  	}
docs: highlight the triggered event and update the log values
  @param ev