Changed user agent. Spotify were blocking the old one.
Fixed track playback

1. Changed user-agent. Again.
2. Added trackingId, refferer and landingURL credentials to auth.php
3. Added screen size log before requesting user details
Removed rtmp
Merge pull request #49 from richard-ive/master

Track playback should work again! Let's hope people don't misuse this again...
Merge remote-tracking branch 'upstream/master'