Add player badge batch job (via zykure).

Add player badge batch job (via zykure).

The player badge batch job uses cairo to generate a summary
image of the given player's statistics. It can be run
periodically to maintain the "freshness" of the data. The
tricky thing with this batch job is getting cairo working
within the virtualenv - one has to install it in the machine
and then symbolically link to the ENV. This is obviously not
ideal, but it does work.

Many thanks to zykure for this well-designed image!