Add running of tests on commit & PRs

[duckduckgrayduck]

No description provided.

[duckduckgrayduck]

When the containers (squarelet, DocumentCloud, documentcloud-frontend) are down, the tests send me one error message for teardown of tests.
Here is when the tests are run locally with make test with all of the tests pre-recorded

Here is when I take the containers down (like when the tests would run in an automated way:

And for good measure, I removed test_users altogether and still got an error on the last test, this time toolbox

[duckduckgrayduck]

The teardown error is due to trying to take down the document and project fixtures with deletes(), which require network access to do so.

[duckduckgrayduck]

Going to close this one, as there are merge conflcits. Pushed Mitch's changes to a new branch to do a PR.