Amqpstorm

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- Fixed a bug in Message.create where it would mutate the properties dict [92] - Thanks Killerama.

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- Fixed pip sdist circular dependency [88] - Thanks Jay Hogg.
- Fixed basic.consume argument type in documentation [86] - Thanks TechmarkDavid.

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- Retry on SSLWantReadErrors [82] - Thanks Bernhard Thiel.
- Added getter/setter methods for Message properties expiration, message_type and user_id [86] - Thanks Jay Hogg.

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- Cleaned up documentation.

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- Introduced a new channel function called check_for_exceptions.
- Fixed issue where a publish was successful but raised an error because connection was closed [80] - Thanks Pavol Plaskon.
- Updated TLS handling to use the non-deprecated way of creating a TLS Connection [79] - Thanks Carl Hörberg from CloudAMQP.
- Enabled SNI for TLS connections by default [79] - Thanks Carl Hörberg from CloudAMQP.

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- Added ability to override client_properties [77] - Thanks tkram01.