Amqpstorm

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- Added support for External Authentication - Thanks Bernd Höhl.
- Fixed typo in setup.py extra requirements - Thanks Bernd Höhl.
- LICENSE file now included in package - Thanks Tomáš Chvátal.

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- Added client/server negotiation to better determine the maximum supported channels and frame size [52] - Thanks gastlich.
- We now raise an exception if the maximum allowed channel count is ever reached.

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- basic.consume now allows for multiple callbacks [48].

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- Added delivery_tag property to message.
- Added redelivered property to message [41] - Thanks tkram01.
- Added support for Management Api Healthchecks [39] - Thanks Julien Carpentier.
- Fixed incompatibility with Sun Solaris 10 [46] - Thanks Giuliox.
- Fixed delivery_tag being set to None by default [47] - tkram01.
- Exposed requests verify and certs flags to Management Api [40] - Thanks Julien Carpentier.

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- Fixed potential Heartbeat deadlock when forcefully killing process - Thanks Charles Pierre.

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- Fixed potential Channel leak [36] - Thanks Adam Mills.
- Fixed threading losing select module during python shutdown [37] - Thanks Adam Mills.