RabbitMQ Publisher Confirms with Bunny

Source https://github.com/ruby-amqp/bunny/blob/master/examples/guides/extensions/publisher_confirms.rb: ```ruby require "bunny" puts "=> Demonstrating publisher confirms" puts conn = Bunny.new conn.start ch = conn.create_channel x = ch.fanout("amq.fanout") q = ch.queue("", :exclusive => true).bind(x) ch.confirm_select 1000.times do x.publish("") end ch.wait_for_confirms # blocks calling thread until all acks are received sleep 0.2 puts "Received acks for all published messages. #{q.name} now has #{q.message_count} messages." sleep 0.7 puts "Disconnecting..." conn.close ```