Add the DestinationExtractor class and its test
Modify both the producer (OrionRestHandler) and the consumers (OrionXXXSink) in order to use the destination header
Modify NotifycontextRequest for getting the entities felds by name
Add the destination constant
Modigy the OrionXXXSink tests in order to work with the detination header
Add a matchin table template
Adapt the documentation according to the new destination header