Make default rake task run test app if it doesn't exist
Merge pull request #1 from bonobos/feature/updates

Feature/updates
Fix a couple things

- define `user_for_paper_trail` on controllers
- add a couple fixes for api controllers
- specs
update comments
fix for problematic sti subclasses

fixes https://www.honeybadger.io/inspector/p/33720/4266446
see code comments