Add test suite and contributing instructions.

Would be great to add Ecukes to this package. Makes adding features and fixing bugs much easier.

I added the boiler plate for ecukes, including what's needed file to get this building on [Travis](travis-ci.org) ([here](https://travis-ci.org/dillonkearns/god-mode/jobs/13070731) is what the output looks like). I included the badge, as well, so if you turn on Travis builds for your repo, this will be good to go. I also added a note about testing in CONTRIBUTING.md.

I'm open to any feedback you have on this. Would like to contribute some bug fixes, so I thought I'd get your thoughts on this test setup first. Thanks for the lovely package, by the way!