Completed the JsonSerializationProcessor implementation.
Fixed issues with acquiring sender identity from various sources.  This is a temp fix.  We want to eventually break this out from the outbound header processor.
Finished implementation of the commanding OutboutHeaderProcessor based on the eventing one.
Updated context files to fully wire up commanding.
Adds basic integration test for commanding.
Fully wired up java command receiver.
Implements basic DefaultCommandBus integration test in Java.
Merge branch 'feature/commanding-fixes' into develop