Keep moving code out of Ridley into this gem

:construction: 

**TODOs**
- [x] Get Travis running
- [x] Add a README and Changelog
- [x] Move / refactor more code in Ridley?
- [x] Release a new major release Ridley gem
- [x] Update this gem to use the new Ridley gem and then release this gem
- [x] ???
- [x] Profit!