Consider using CI (continuous integration)

[Nicky McCurdy]

While Streem is young enough that we probably won't need a full unit test suite any time soon, in my opinion it still would be helpful to have some basic smoke tests (or something like that) running in CI (especially since there are so many pull requests lately, and CI can be pretty helpful in finding bugs that people may not notice otherwise). Travis is especially useful for testing open source projects without being too complex to set up and I particularly like it, though any CI system would work.