title: Consume all messages using MassTransit
body: <p>I'm currently building a system using MassTransit and RabbitMQ as my messaging layer.  I'm trying to find a way to have a Consumer that listens on all messages of all types on the bus.  This is for our audit logging framework and we want to log all of the events going across the message bus.</p>
  
  <p>Is there a way to do this in MassTransit?</p>