port to PyGithub so repo creates work again

Ignore-this: 5e00f0483c54df98dddda680b00d1318

darcs-hash:20130109074024-312f9-ebbbb2a249df53cd4f89541a6e0eac47ab13813c
don't waste time scanning repos that appear to have no recent activity

Ignore-this: 9a29d293662729aa46d775c4b5d31146

darcs-hash:20130109074113-312f9-e408b7f480c5ff43a23ba2716d4c03fe621b4ae3