added fractaljs to labs

I would like to introduce a new framework library, FractalJS, to the family of todomvc.
You can find more information at http://gree.github.io/fractaljs/

Following things have been checked before this PR
1. Passed all automated browser tests (the result is pasted as comments below).
2. Adjusted coding style.
3. No errors from JSHint.

Let me know if there is any problem.

Thanks