Asynqp

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* Channels will no longer break if their calls are cancelled. Issue 52.
* Fixed message properties decoding without `content_type`. Pull request 66.
* Added `nowait` argument to Exchange and Queue declarations.
* Added `passive` argument to Exchange and Queue declarations.
* Added `on_error` and `on_cancel` callbacks for Consumer. Issue 34
* Changed the closing scheme for Channel/Connection. Proper exceptions are now
always propagated to user. Issues 57, 58
* Complete internals refactor and cleanup. Rull requests 48, 49, 50.
* Add NO_DELAY option for socket. Issue 40. (Thanks to socketpair for PR 41)
* Change heartbeat to be a proper background task. Issue 45.
* `loop` is now proparly passed to all components from open_connection call. Pull request 42.
* Add support for Python up to 3.5.

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* Improved error handling.
* When the connection to the server is lost, any futures awaiting communication
from the server will now be cancelled.
(Thanks to lenzenmi, in pull request 19)
* More detailed exceptions on channel closure.
* Support for custom RabbitMQ extensions by an `arguments` keyword parameter for a number of methods.
(Thanks to fweisel, in pull request 27)
* Improved compatibility with RabbitMQ's implementation of the
wire protocol, including better support for tables.
(Thanks to fweisel, in pull requests 24, 25, 26, 28)
* Support for a `sock` keyword argument to `asynqp.connect`.
(Thanks to urbaniak, in pull request 14)