Made primary_key autoincrement=False in versioning example.
Fix typo in comparator_factory example
Merged in bacher09/sqlalchemy (pull request #5)

Fix typo in comparator_factory example
Merged in prschmid/sqlalchemy (pull request #4)

Made primary_key autoincrement=False in versioning example.
- changelog
- clean up these tests to not use globals so much, close out the session
0.8 changelog
Improved support for the cymysql driver, supporting version 0.6.5,
courtesy Hajime Nakagami.
- spot checking of imports, obsolete functions