Removed Timeline.onChange and added the "change" event. Minor doc updates.

Signed-off-by: Grant Skinner <info@gskinner.com>
Removed Tween.onChange(), and Tween.removeTween(). Minor doc tweaks.

Signed-off-by: Grant Skinner <info@gskinner.com>
Updated VERSIONS.

Signed-off-by: Grant Skinner <info@gskinner.com>