Travis CI basic configuration

[mattrossman]

See #18

[mattrossman]

To test locally, install pytest with

pip install pytest

and run

pytest

from the project root. Both tests should pass.

[mattrossman]

I'm not totally clear on how the default Travis CI environment is set up, but from what I understand it has access to pytest automatically. travis-ci.yml might need some tweaks to get the environment properly set up but we can see what happens after a test build.

EDIT: I'm a idiot, should be .travis.yml not travis-ci.yml

[mattrossman]

Build is passing, should be good to merge