Fix logic for showing rank in JSON lb endpoint.
Fix leaderboard/username/json... Sigh.

Hack around the ORM trying to do N+1 again.

I know I'm in the minority here (within Fedora), but I hate ORMs. :(
Merge branch 'develop' into leaderboard_slowness
Merge pull request #159 from fedora-infra/leaderboard_slowness

Leaderboard slowness