GitLab

Support for registration, login and invitations
Rough librefm theme for the web front end (someone else can make it pretty)
Web installer script (just sets up configuration, shares gobbler's database)
Update gobbler install script to create invitations table

Checking is still not properly done in auth stage #2, but records are
now being updated in the database.

Initial commit for gobbler (last.fm compatible audioscrobbler). Just a simple install/configuration script for now.