Fixed py3k support
Fixed tzinfo
Fixed default values
Added py3k test cases, json datetime encoding fix (requires native datetime), py2.x thrift fix
Bumped version to 0.5.1 to reflect python 3 support
Updated readme to show how to run python 3 tests
Updated readme with thrift / python 2.x note
more readme verbage
maintain compatibility with python < 2.7

see http://docs.python.org/2/library/sys.html#sys.version_info
Version bump
Fixed for naive datetime objects