Merge pull request #166 from fsteeg/issue-111-hadoop-1.2.1

Update to Hadoop 1.2.1
Rename method for better clarity
Fix wrong rdf/xml root element
Add gnd-rdfxml-splitter-serialization test
Remove redundant test
Merge pull request #169 from dr0i/gnd-updates

Gnd update: splitting rdfx/xml so that every entity is serialized as a single rdf file