Merge work from @BGerstle-WMF's fork which sets up Travis CI for continuous testing (and eventually coverage reports).
Acceptance criteria
Given I am working on Wikipedia iOS project
When I submit changes for review
Then tests should run on those changes
And the result of the tests is posted to the code review
Given I have submitted changes to the Wikipedia iOS project for review
When I update those changes
Then the tests should run
And the result of the tests is posted to the code review