Flow control and tests are missing.
Even though that RabbitMQ uses TCP pushback for connection wide flow control, at least implement handling of flow control messages for the sake of completeness.
Fixed in b97f08f
Implement confirm.select, ack/nack/return/flow
Closes #26 ref #28
Adds notify listeners for asynchronous messages other than
basic.delivery arrive from the server. These channels are also closed
when the channel enters shutdown.