Touch not detected properly on Windows Phone

[RByers]

IE fires mouse events for touch before firing any touch events. This breaks the approach used by the polyfill (looking for events that occur immediately after touch events). I could perhaps hack around this with a UA check - forcing firesTouchEvents to always be true for IE on Windows Phone, but would that always be right? Eg. does Windows Phone support bluetooth mice? Also what about desktop IE with touch event support explicitly enabled?

This is complicated enough that I'm going to leave Windows Phone unsupported for now. Perhaps @jacobrossi will submit a PR :-)