Working basic playlist generation
Merge branch 'master' into backend

* master:
Initial soundcloud embed tests.

Switched playlist route to serve JSON. Created basic javascript MVC framework. Got test file with playlist loading, next, prev, and tracklist functionality. Next up: autoplay next track when current track finishes.
Basic playlist interface functionality
All basic featres in place.

Some scrobbling weirdness. Needs style and
behavior tweaks.