STANBOL-1200: The RdfEntityDataIterator now uses an iterator that also works if the SesameRepository does not provide triples sorted by Subjects. This new iterator however requires to keep subjects in memory to filter out duplicates

git-svn-id: https://svn.apache.org/repos/asf/stanbol/trunk@1550448 13f79535-47bb-0310-9956-ffa450edef68