adding asset_path to the url's and renaming the file into a .erb
Merge pull request #13 from rbarrera87/13-Add-asset-path-to-custom-css

Add asset_path to custom.css
new models (quiz, question and answer) for quiz, and its tests
more tests and logic for correct answers
Merge pull request #15 from rbarrera87/15-Quiz

Quiz (only models)
Merge branch 'master' into login