Merge pull request #144 from nilshartmann/master

More development
~ temporary removed expand menus
Implemented Virtual Root as JDK Proxy (reverse-merged from commit f02aaf2ac6223d74f16f01911dd52ed34a485c6e)
Fixed Virtual Root Proxy
Merge branch 'master' of https://github.com/wuetherich/bundlemaker.git

Conflicts:
	main/org.bundlemaker.core.ui.artifact/src/org/bundlemaker/core/ui/artifact/tree/ArtifactTreeContentProvider.java