Allow to specify headers when binding queue to the exchange

[matino]

Currently the queue can by bound to exchange, but only with the routing key:

def bind_exchange!
       .....
          @hare_info.queue.bind(@exchange, :routing_key => @key)
        end
      end

For headers exchange type it should be possible to provide headers for the binding instead.
See https://www.rabbitmq.com/tutorials/amqp-concepts.html "Headers exchange" for more details.