Beef up unit tests

[JohnGiorgi]

The current suite of unit tests leave a lot to be desired. Steps to improve this:

• [ ] Set aside enough time to learn the in's and out's of pytest and make sure I am using it to its full advantage. Also a generic brush up on best practices for unit testing would be a good idea.
• [ ] Work toward 100% coverage. At the very least, cross the 90% coverage mark.
• [ ] See if I can re-write the slowest unit tests to speed things up.
• [ ] Setup up TravisCI for testing on MacOS and Windows
• [ ] Write unit tests for the web-app. See here.
• [ ] Optional: move code coverage to codacy from coveralls, just to use one less tool and simplify things.