Python 3 test failures

I'm working on the Python 3 version of the package. There are a couple of test failures:

test_requests_are_dumped_to_file() fails under Python 3.3, I suspect because of dictionary iteration order dependencies (remember, in Python 3.3, we have random hash seeds enabled by default).

test_pep8() fails because we do not (yet, see http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=694564) have a Python 3 compatible pep8 library in Ubuntu. Probably the easiest thing to do until then is to skip the test under Python 3.