jQuery.event.drag supports touch events

[daffl]

Use touch events if available like:

var supportTouch = !isPhantom && "ontouchend" in document,
    // Use touch events or map it to mouse events
    touchStartEvent = supportTouch ? "touchstart" : "mousedown",
    touchStopEvent = supportTouch ? "touchend" : "mouseup",
    touchMoveEvent = supportTouch ? "touchmove" : "mousemove",