Move blank-node skolemization logic into JcrRdfTools
Add test demonstrating PATCH with blank node references
Remove RepositoryService#getNamespaceRegistryDataset
Merge pull request #520 from fcrepo4/fix-blank-nodes

Fix blank nodes
Update DefaultIdentifierTranslator to return the right value for the root resource
Support Hash URIs
Merge pull request #529 from fcrepo4/remove-ns-dataset

Remove RepositoryService#getNamespaceRegistryDataset
Use Event.getMixinNodeTypes() in default filter, instead of pulling back the whole object