ReliableChannel component

Two changes:

• Add publish!! to the ReliablePublish protocol
• make ReliableChannel

The publish!! function can be used to reliably publish to RMQ in a synchronous manner. It also enables client code to not depend on core.async.

Make the ->reliable-chan return a ReliableChannel. This enables client code to extend it to new protocols.

ReliableChannel participates in component/Lifecycle.

NOTE: ReliableChannel is not intended to be used globally!

Conduit No Longer Creates Queues

Conduit no longer modifies RMQ broker topology.

Fix Connection Recovery Issues

• Set the basic.qos prefetch-countto the Subscription's
  buffer-size. This facilitates successful recovery.