Switched to Johnny Cache. User caching works.

Summary:
Now we get all queries cached directly.
Not sure if it scales that well, but it works...
Also, not sure if we will EVER have transaction problems. Hope not :)

Test Plan: Go anywhere, check runserver logs for DB. Should only have session.

Reviewers: bogdan2412

Reviewed By: bogdan2412

Differential Revision: http://phab.code4fun.de/D9