Uses jena version 2.12.0 and removes workaround for bug JENA-663.
RDFConfiguration: added a method to load comma separated config values.
Enhanced and renamed the DSORelationsConverterPlugin into SimpleDSOR...

Renamed the DSORelationsConverterPlugin into
SimpleDSORelationsConverterPlugin.
Overhault the Plugin: it can be configured now and it can create
multiple links per DSO Relation.