Add Travis CI to the repo to lay the groundwork for automated testing.

[rikai]

See this page for the basics, eventually want to test across a variety of versions for various breakages, but for now, getting it working at all on one version is the goal.

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[rikai]

This would also require us to write some tests, if anyone wants to do that.

[eriknelson]

+1

I'll be posting my live PR soon so the functionality is available, but I'll probably take a second refactoring pass. A lot of it could be refactored for encapsulation and light dep injection in pursuit of easier testing. I can start to look into this.