Merge pull request #236 from nicolas-f/feature/popup-menu-osgi

Feature/popup menu osgi
Create README.md
Do not add class files that are in the root of the classpath (means no package)
Fix imports
Merge branch 'fix/export-package' into feature/osgi-manager-gui
Read packages Version in Manifest for built ins packages
Assembly:single is not used anymore, each package remain in a sub directory instead of merged into a single one. This kind of distribution preserve MANIFEST.MF, used by OSGi host framwork