pack{Tgz,Tbz,Txz,Zip}Archive tasks
Merge branch 'develop' of github.com:xerial/sbt-pack into develop

Conflicts:
	project/Build.scala
	src/main/scala/xerial/sbt/Pack.scala
fixed scripted tests
added individual publishPack{Tgz,Tbz,Txz,Zip}Archive settings
Merge pull request #56 from mkroli/develop

pack-{tgz,tbz,txz,zip}-archive