fix issue:
    onTouchEnd did not call the correct mouse up handler
for fix I made to onTouchEnd:

1. remove IE8 related code as it does not support touch anyway
2. use event.changedTouches [ 0 ] rather than event
Merge pull request #159 from ethanli83/master

Fix for onTouchEnd
changelog update for #159
Merge branch 'master' into custom_zoom_handler
fix: remove the useTransform/SVG stuff and move back to a simple onDraw callback only so people can handle their own custom drawing and sizing