Add acceptance test for The Twelve Days of Christmas
Add acceptance test for the house that jack built
Add acceptance test for food chain
Add acceptance test for 99 Bottles of Beer
Add checkerboard test suite
Add readme to checkerboard exercise
Add extract verse step
Merge branch 'house'
Merge branch 'checkerboard'
Add acceptance test for bottles
Merge branch 'twelve-days'
Merge branch 'food-chain'
Paste whole song in.
Change to verse representation
Extract 'this is'
Simplify into verse_subjects
Remove extra method.
Move to maybe unnecessary VerseSubject class
Clean up syntax
Change to recursive approach