Add verse method
Just return 8 bottles of beer verse
Make 8 bottles verse work using the remaining param
3 bottles also works
Make 1 bottle work
Make 2 bottles work
Change if to case statement
Sing no more bottles
Add verses method
Add basic version of verses
Clean up verses

Calling #downto without a block returns an Enumerator, which we can use
like any other enumerable.
Sing the whole song
Make the verses more readable
Merge branch 'bottles_2'

* bottles_2:
  Make the verses more readable
  Sing the whole song
  Clean up verses
  Add basic version of verses
  Add verses method
  Sing no more bottles
  Change if to case statement
  Make 2 bottles work
  Make 1 bottle work
  3 bottles also works
  Make 8 bottles verse work using the remaining param
  Just return 8 bottles of beer verse
  Add verse method