Cookbook refactored
Merge pull request #25 from lewagon/cookbook-refactored

Cookbook refactored
Merge branch 'master' of github.com:lewagon/promo-3-challenges
after teacher
Rakefile to check file exists
Count lines to validate exercise
Rakefile testing CSS file size
All CSS exercises tested
Invert arity
Test bootstrap grid exercise
Need 3 html files
Empty 0/0 tests for JS exercises
Merge branch 'master' of github.com:lewagon/promo-3-challenges
done