Add retina_quality processor
Refactored paperclip spec
Set default retina quality
Update README.md
Better test coverage. Retina quality should override regular quality.
Update README.md
Add retina quality support for Paperclip
Merge branch 'retina-quality' of github.com:jhnvz/retina_rails into retina-quality
Update README.md
Merge pull request #9 from jhnvz/retina-quality

Retina quality