[pygame] Rotating Images on a specified axis.

[Caleb Mahase]

I'm trying to make an overhead tank battle game. The biggest problem I'm 
running into is rotating the turret over the tank chassis. In order to 
do so, I  need to be able to specify the axis on which the turret image 
will rotate instead of just rotating around the middle. The PysGear 
library seems to have solved this problem however I would like to avoid 
using an entire library to solve one problem. Any info on this issue 
will be greatly appreciated.

-Cal