Tests before merge

[surajssd]

After a maintainer does merge, tests should run with PR rebased with master, and if all tests pass then only merge should happen. I think this can be implemented with travis.

[cdrage]

@surajssd I've gone ahead and enabled this within GitHub. Tests are now required to pass before merging in (can't merge in without travis being 💚 )

[surajssd]

@cdrage awesome thing!