stop actors when connection fails
packager actors named
Unreachable message no longer includes Throwable

The Throwable may contains ActorRefs that are not necessarily 
understandable by the other side.
provider actor properly named
Destroyed message implemented

IsAlive/Unreachable was not sufficient to cleanup all packagers in a 
timely fashion. The dispatcher is now watching all actors receiving
messages in order to be able to inform the peer about terminated actors.
ssl re-enabled
reconnecting fixed
Merge pull request #22 from IDgis/protocol-fixes

Protocol fixes