Add support for mobile browsers

[JamesMGreene]

This library does not currently support the "touch" events necessary for it to work on mobile browsers.

Start with this touch detection technique leveraged from jQuery Mobile:

var touchSupported = $.support.touch || "ontouchend" in document;

Honestly, not sure if either will be necessary since a "click" event has certain sequential requirements that normal touch events don't meet individually: i.e. touchstart, minimal touchmove if any, touchend on the same element (or in very close proximity), and none of the handlers for those call event.preventDefault();... then, and only then will the mousedown, mousemove, mouseup, and click sequence of events be allowed to start..

[JamesMGreene]

Also keep the MSPointer events in mind. Again, not sure if it will be necessary to do anything for those since the "click" event is pretty particular.