fix up song creation form and action
Merge pull request #14 from byronmwong/feature/fix-up-song-creation

fix up song creation form and action
Merge pull request #15 from johnmanong/master

added description to groups, added spec tests for group model and membership management
Create Post model with TextPost and SongPost subclasses
change up add_post API to not take an instantiated model. add remove_post and tests
fix group post tests to not be order dependent
Merge pull request #16 from byronmwong/feature/posts

[WIP] Create Post model with TextPost and SongPost subclasses
create PostLike model and tests
Merge pull request #17 from byronmwong/feature/likes

create PostLike model and tests