Test commit

just a test, will delete later
Add function cancelTweener

Add function cancelTweener(), which allows to stop and remove all tweens
/ callbacks before the tween has finished.
This file may not be needed anymore

As GitHub keeps the log of changes, backups are not needed.
Updated version of crafty to latest to date.
Update jquery version of the example.
New example, demonstrating use of the function cancelTweener()
fixing some typos
only clean _tw_step if not null

fix a bug that happens when _tw_step is null. Also, the function now
returns this.
Merge pull request #4 from danyalejandro/master

Update crafty version and add cancelTweener functionality