Fixed an issue with python 3.3.1
Fixed an issue with python 3.3.1

Thanks to Claudio Canepa for the patch.

Fixes issue #704.

oktayacikalin/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet,theblacklion/pyglet,theblacklion/pyglet,theblacklion/pyglet,oktayacikalin/pyglet,oktayacikalin/pyglet,theblacklion/pyglet