ws
Include non-strict inequality for delivery tags
Make unconfirmed_set publicly accessible

This is useful for implementing message retries
Add a basic confirm listener implementation

Probably should have some sort of thread safety, but
that sounds like work.
Merge branch 'master' into network_failure_detection
Initial network failure recovery bits

Currently TCP and then AMQP 0.9.1 connection are recovered, then
channels. There is no queue/exchange/binding/consumer recovery yet,
this will follow amqp gem's strategy.
Ignore *.dump files