Bump version

Update the release date

Fix the docs for real [ci skip]

Fix the cleanup of socketpair when closing down a connection

Version history updates

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Misc updates

- PEP8 cleanup
- channel.py/connection.py: Check to see there is an actual exception being raised, not just a type of exception passed in (Python 2.6 issue)
- channel.py: specify the default priority of None

Changes to support pamqp 1.6.0

- Update how message property data types are retrieved
- Fix tests relying on .__dict__