Add documentation to cwfm.song.js and improve code readability.
Improve style of list of playlists in playlists tab.

- Adds a background color to the active playlist.
- Moves the song count badge to the right of the playlist and includes
  the word "songs" to incdicate what we're counting.
Merge pull request #10 from eojthebrave/cwfm_song_js_cleanup

Add documentation to cwfm.song.js and improve code readability.
Merge pull request #11 from eojthebrave/playlists-list-cleanup

Improve style of list of playlists in playlists tab.
Merge of eojthebrave:eojthebrave-3-player_initialization