Set up tests + travis ci for newslynx-core

[mhkeller]

No description provided.

[mhkeller]

This can be done in smaller lifts / those with more assumptions

• a simple test to run python setup.py install without errors, which can be done with travis
• a command to run through all the tests in tests/ but that assumes you have a postgres db up and running and redis

[abelsonlive]

turns out this is really easy to do with Travis, once I go back and refactor the tests a bit, i should be able to run the api itself and fully test everything:

https://github.com/newslynx/newslynx-core/blob/master/.travis.yml