Junk track filter

Seems to be working well now, aside from some accuracy issues.  User is able to select a genre, and then a mood.  Echonest finds a playlist of tracks, which are sent to soundcloud.  Soundcloud finds the url for tracks matching the title, and the track is played.  
The player widget holds arrays full of track urls and track titles so that the user can eventually hit "next" and it'll go to the next song.

Let me know what can be improved!
@sgharms @linkblaine @amixofpersons @karinacarmona @DakotaMeadows