add github and pragmatic to the supporters section

![Screen Shot 2013-04-03 at 2 17 07 PM](https://f.cloud.github.com/assets/928367/335373/cc314836-9c8a-11e2-87c6-b56d4b4f814e.png)

Swapped out good ole Agilion and Gristmill for these two baddies.

@beerlington and @tristanoneil what do you think?