Broken attempt to add LocalStorage

The playlist saves properly when tracks are added/removed
(i.e., `playlistModel.get('position')` in console returns the right
result), but the playlist model isn't properly updated when you reload
the page.
Fix localStorage persistence
Simpler syncing
Stray comma
Make song change when playlist position does
Kill spurious console logs
Sync playlist to LocalStorage.

(Merge branch 'add_localstorage')