Ensure 'c.iso8601.FixedOffsets' unpickle cleanly under Py3k.
Merge pull request #106 from Pylons/FixedOffset-py3k-unpickle

Ensure 'c.iso8601.FixedOffsets' unpickle cleanly under Py3k.
Unpickling was borked on all Pythons.
prep for 1.0a3
update changelog