Get nested objects using SPARQL queries.

We are using this as a workaround of non-working nested object mapping of RDFBeans library. May be in the future we might consider switching to SPARQL in all cases, thus getting rid of RDFBeans at all.
Add mote tests of Person Roles parsing.
Add AppOptions for application command line options.
Improving JavaDoc and add check that the repository has been initialized before first use.
Add condition to not double initialize repository.

- Also did some small refactoring (method renaming)
Add test for JBoss.org generated DOAP.

- More refactoring
- Add CLRunner
Replace hardcoded version number with pom property.
Add proposal of project JSON Schema.
Testing improved narayana.rdf
Excluding Magnolia field excludeInProjectMatrix. It is not needed.
Add README.