Add fast_finish to travis.yml
Add fast_finish to travis.yml

This will make Travis report the final status as soon as no other builds can have any impact on the final status. So if 1 build fails it will already report that the overall status is failed, if there are only jobs left that we allow failures of, it will mark the PR as a success.

[More info in their blog post](https://blog.travis-ci.com/2013-11-27-fast-finishing-builds/)
appfolio/farcy,appfolio/farcy,appfolio/farcy