Added Travis CI

You'll need to follow [these steps](http://about.travis-ci.org/docs/user/getting-started/) to get your Travis account setup.

After you've created the account, go to the Travis site, rollover your name in the top right corner and click accounts. Scroll down to where it says Frank and flip the On switch. Then click the little wrench. That should switch you back to Github and add the Travis token for you. After that Travis will probably email you letting you know the status of your first build. Any push to the repo (on any branch) from then on will be run using Travis.