systemd for Debain implemented
systemd support for rpm implemented
Merge branch 'master' of github.com:sbt/sbt-native-packager into wip/systemd

Conflicts:
	src/main/scala/com/typesafe/sbt/packager/archetypes/JavaServerApplication.scala
adding some notes about systemd to readme
readme updated
Merge pull request #256 from kardapoltsev/wip/systemd

FIX #249. Systemd support for Debian and Rpm