This is how to start the leaderboard server.
./run.sh
This will start the server on localhost:3020.
Here is an example of a JSON call to update "Willem"'s score. The new score can be viewed on the leaderboard server.
curl -v -H "Accept: application/json" -H "Content-type: application/json" -XPOST http://localhost:3020/update_score -d '{"username":"Willem","password":"abcde","score":3230,"kills":40,"died":1,"lat":52.3,"long":3.9,"ping":"2013-03-28T09:49:00Z","offline_time":15312,"online_time":12}'