TODO

- breaks with header values that are nil
- breaks with header values that are ruby objects (convert to strings?)

- add peek and pop to queues
- use rabbitmq generated consumer tag from basic.consume-ok reply

- allow temporary queues with amq.queue(nil) syntax (use uuids)
  - use as temp queue in rpc
  - use uuids for message ids in rpc

- add ack/completed responses for messages
- deleting queues/bindings/exchanges
  + queue.unbind
  - queue.remove or queue.close or queue.delete
  - exchange.remove
  - rpc.remove

- handle errors and exceptions
    binding to a non-existent (or not yet created in clock.rb) exchange
      #<AMQP::Protocol::Channel::Close:0x11d35d4
       @class_id=50,
       @debug=1,
       @method_id=20,
       @reply_code=404,
       @reply_text="NOT_FOUND - no exchange 'clock' in vhost '/'">>]

- handle connection.redirect during connect (for rabbitmq in distributed mode) [or just set insist to true]

- add amq.queue('name').size{ |num| "#{num} messages in the queue" } (send declare passive, look at declare-ok response)
- clean up AMQP::Channel.default on disconnect