[docs] Code, test, and doc review for PEP-0435 Enum (issue 17947)

[alex.gaynor at gmail.com]

http://bugs.python.org/review/17947/diff/8161/Lib/enum.py
File Lib/enum.py (right):

http://bugs.python.org/review/17947/diff/8161/Lib/enum.py#newcode146
Lib/enum.py:146: enum_class.__module__ = 'uh uh'
Can we use a slightly more formal value here?

http://bugs.python.org/review/17947/