Path management: export maven and plugin libraries

Change-Id: I66617a48aa9ac0738eeab4eaebc50158fce7b3cd
Signed-off-by: Nico Rutishauser <nr@hotmail.ch>
update model: Add methods and add UserMessage (with queue)

Change-Id: Iedf13d03052b3ad0cc0c3050bca7899eaef0230d
Signed-off-by: Nico Rutishauser <nr@hotmail.ch>