MARMOTTA-440: improved error handling in rdf-patch parser
MARMOTTA-440: Moved rdf-patch to a separate module (marmotta-utils-rdfpatch)
MARMOTTA-448: moved vocabularies into a separate module: marmotta-model-vocabs.
Also fixed some redundant dependencies.
MARMOTTA-440: Improved rdf-patch module, can now also create diffs.