Amqpstorm

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

-------------
- Cleaned up documentation.

-------------
- 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.

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

-------------
- Fixed Connection close taking longer than intended when using SSL [75] - Thanks troglas.
- Fixed an issue with closing Channels taking too long after the server initiated it.

-------------
- Added support for passing your own ssl context [71] - Thanks troglas.
- Improved logging verbosity on connection failures [72] - Thanks troglas.
- Fixed occasional error message when closing a SSL connection [68] - Thanks troglas.