Update AlbumsController#new and #create to work with a variable number of songs being submitted
Update reform gem to latest (0.2.6)
We don't need to provide a save method in AlbumForm if Reform::Form::ActiveRecord is included.
Apparently it doesn't get included automatically (https://github.com/apotonick/reform/issues/72).
Fix: when you edit an album and change one of the song titles, those changes were not saved!