added MM relationship and refactored unit tests
added unit tests for MM relationship between songs and albums
added unit tests for MM relationship betwen album and song and flash messages for their validation
improved errors using underscore and flash
styling change
implemented song picker for albums
implemented angular drag and drop control
refactored to use angular model
refactoring
removed existing songs from song quick find
added unit tests for new album angular controller behaviour"
added api unit tests
added unit tests for flash messaging
grammar change
refactoring
added additional assertions
refactored
Merge pull request #7 from davidjconnolly/feature/many_to_many

Feature/many to many