Add Commitment Package.

Sublime Text (2 and 3) adoption of the great [Commitment](https://github.com/ngerakines/commitment) project by @ngerakines.

Visit http://whatthecommit.com/ for the web version.
```
(\ /)
(O.o)
(> <) Bunny approves these changes.
Permalink: http://whatthecommit.com/0e0c1a4060a298158f3c4ef526f03f86
```