implemented music delete api
implemented delete music for client-side
Merge pull request #54 from yagince/music-delete

implemented music delete api
エラーメッセージにTwitterBootstrapのcssを当てるようにした
MusicSpecのテストでJava heap spaceが出て落ちる件を対応
Merge pull request #56 from kannokanno/fix-test-heap-error

MusicSpecのテストでJava heap spaceが出て落ちる件を対応
Merge pull request #55 from kannokanno/design-register-error

エラーメッセージにTwitterBootstrapのcssを当てるようにした
Merge pull request #57 from yagince/music-delete-ui

implemented delete music for client-side