tumblr: Gets and serves images, videos and audio.

Also uses an _auth file like flickr and facebook, and I remembered
to revoke access using the keys I stupidly committed!
tumblr: Instructions in the README
flickr: More use of .left and .right
last.fm: Started work, do not use. Schema will change.

ATM I'm using this awful strategy of giving each user their own db.
Will change this and everything else to have the following:
- User: contains data currently in user/data.json
- Artist
- Album
- Track
- Play: basically a DateTime linked to a track and a user

Oh, and need to make sure to add play_count to relevant things,
otherwise it will be as slow as it is now.