Added new respondWithUow directive to add the X-UOW header back in the response.
Changed ActorLogging to just propagate the trace context (does not add to the MDC anymore).
Created UowConverter to let logback know where the extract the UOW from.
Changed logback dependency to provided.
Promoted the logback converter to its own file.
Merge pull request #11 from crypticmind/master

-MDC +Logback Converter