Delete process manager was not deleting the process manager document from
MongoDB

The delete query was incorrect, it was querying for CorrelationId at the
top level rather than in the Data sub document.
Moved the serializer classes out of the RabbitMQ assembly and into Core.  We now inject the serializer into the RabbitMQ producer class.
Merge branch 'master' of https://github.com/R-Suite/R.MessageBus