Fixed NPE when BundleCandidate has not MavenArtifact extension
#12: BundleUtils.getEmbeddedBundles(...)
#12: Introduced PackageDeclarationCombiner to combine package
declarations + DynamicPackageImportAppender uses
PackageDeclarationCombiner to merge dynamic imports of embedded bundles
Merge branch 'pu/12-embed-deps'