[py3k] unicode → six.text_type

[py3k] Don't encode URLs Python 3's urllib works with unicode objects.

[tests] Stop counting pickle bytes in ResultSet tests Between python 2's pickle and cPickle implementations, the various protocol versions added in python 3, the length of the pickled string is completely unpredictable. Instead, do a simple round trip and test a few attributes.

[tests] Port unittest_cwctl to py3k On python 2, sys.stdout takes bytes-like objects whereas python 3's takes unicode-like objects and handles the encoding on its own.