shapefile.py fix for drawcounties and python 3.3 clobbered

[bryancusatis]

Hello,

It appears that the change for shapefile.py and the default_encoding being able to be set got clobbered with a merge. That means that drawcounties is broken again in the latest release. I'm fixing mine locally but figured I would let you know.

[jswhit]

Sorry about that. I've created a pull request for this at #131.