Tap gestures no longer triggered by "touchcancel" browser events

[samuelhorwitz]

Fixes #324. Tap gestures on Android would be erroneously fired during scroll due to touchcancel events being treated as proper touchend events.

[tjsmatt]

Unless I'm mistaken, this fix won't resolve the issue in IE10+ unless you also check for pointer events with something like:

if(ev.eventType == Hammer.EVENT_END && ev.srcEvent.type != 'touchcancel' && ev.srcEvent.type != 'pointercancel' && ev.srcEvent.type != 'MSPointerCancel') {
    ...

If it'd help, I can probably figure out how to fork and send you a pull request. Haven't done it before, though, so it'd be a learning experience.

[lloiser]

shorter (and maybe also easier to read):

if (ev.eventType == Hammer.EVENT_END && ev.srcEvent.type.toLowerCase().indexOf("cancel") < 0)