Fix tests of 01-Ruby / 04-Hash-Symbols / Optional-03-Shopping-Cart
Update exercise README
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
Cookbook refactored
Merge pull request #25 from lewagon/cookbook-refactored

Cookbook refactored
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 remote-tracking branch 'upstream/master'
exosolved