Fix tests of 01-Ruby / 04-Hash-Symbols / Optional-03-Shopping-Cart
Merge pull request #24 from lewagon/01-Ruby/04-Hash-Symbols/Optional-03-Shopping-Cart

Fix tests of 01-Ruby / 04-Hash-Symbols / Optional-03-Shopping-Cart
Merge branch 'master' of github.com:lewagon/promo-3-challenges
Cookbook refactored
Merge pull request #25 from lewagon/cookbook-refactored

Cookbook refactored
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Solve conflicts
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