Add RabbitMQSubscriber using gevent
Add RabbitMQSubscriber using gevent

Now we have a way to asynchronous consume new messages. it is using
gevent for now, but, I intend to change that to py3.5 new async/await.

WeLikeAlpacas/Qpaca,csarcom/python-pubsub,WeLikeAlpacas/python-pubsub