Fixed ChipKIT paths for avrdude

Hey - I was having some problems with the ChipKIT Makefile and had to update some paths in the template file. I'm using Mpide 0023-macosx-20120803. Not sure if these changes were needed because I'm using a different version of Mpdie than yourself. Thought I'd send you over my modifications none-the-less.

Hope this finds you well,
Colin