Re-evaluate pulse prefetch options

[marco-c]

There is a no_ack method for basic_consume. This way we could run pulse listener for the same queue on different machines without incurring in the problem of getting the same message on different machines.

[marco-c]

Reading a bit the documentation of RabbitMQ, it sounds like duplicated messages might not be possible.
From https://www.rabbitmq.com/confirms.html#automatic-requeueing:

When manual acknowledgements are used, any delivery (message) that was not acked is automatically requeued when the channel (or connection) on which the delivery happened is closed.

[La0]

Depends on #20

[marco-c]

We are currently using prefectCount of 1 and prefetcSize of 0, this could adversely affect performance.