Retrieval of paginated Annotation Sets
Added ApiKey parameter to all the calls. Now it is just for logging purposes but it might become important for access control.
Updated tests to include the newly requested ApiKeys
Annotation Sets controller and queries by URL for entire targets of fragments (Having an issue with the JSON-LD context that is not translated correctly, oa:hasSource becomes a Literal instead of a URI).
SPARQL queries for validating Open Annotation content