Fix Python tests with AppEngine for Travis

[NoiSek]

Created to help narrow the scope of #12.

Figure out how to get AppEngine working on Travis and uncomment the basic tests at tests/conftest.py + tests/test_root.py.

Starting points:

• https://cloud.google.com/appengine/docs/python/tools/localunittesting
• https://github.com/LikeMyBread/Saylua/blob/master/Vagrantfile#L53