Handle minor touchmoves in tap events

[heff]

First referenced here:
#672 (comment)

Currently the tap event is only fired with the following sequence:

• a touchstart event is fired
• no touchmove or touchleave events are fired
• a touchend event is fired

But there may be cases where the user's finger moves slightly during the tap, causing a mousemove. We should account for this by allowing for ~10px of movement during the tap event.

The tap code is in component.js
https://github.com/videojs/video.js/blob/master/src/js/component.js

[heff]

Being fixed by #1111

[heff]

Fixed by #1111