Add Javascript tests and add to Travis

[artasparks]

Dependent on change the UI to be more client-side (via AngularJS or similar). Once we have more JavaScript we'll need to run both python and JS tests on one travis config. It's not trivial, but it's not too hard:

http://stackoverflow.com/questions/18456611/is-it-possible-to-set-up-travis-to-run-tests-for-several-languages

[duckpunch]

What would this test? Isn't the UI just backend templates at the moment?

[artasparks]

See my comment. I had yet to create my issue that contains the relevant proposal.

#29