NTripleEncoder is a modified version of PipeEncodeTriples

- subject can be set from outside
bugfix_ </oai_dc:dc> end tag is closed properly now
treat literals as literals
test against the api not against lobid
dc prefix fits to standard OaiDcEncoder
Merge https://github.com/lobid/lodmill into qdc_to_lobid_conversion
javadoc for setSubject
qualified dublin core to lobid conversion DIPP style
add DippQdcToLobidTest to UnitTest Suit
Merge pull request #142 from jschnasse/qdc_to_lobid_conversion

qualified dublin core to lobid conversion + update of lobid to oai_dc conversion