manifest builder api
further manifest builder improvements
update to newer manifest commons
adapted to changes in commons
#6: Made osgifier.treatInheritedPackagesAsInternal configurable, defaults to false
#6: Extracted enum VersionRangePolicy + Tests
#6: Introduced PackageResolver
#6: Renamed AccessModifier to AccessRestriction
#6: Renamed PackageOffer to PackageExportDescription
#6: Use List on PackageResolutionResult
#6: PackageResolverTest
Merge branch 'pu/6-import-versions'
Merge branch 'manifest-builder-api'