Jenkins build is back to stable : stanbol-trunk-openjdk-8 #75

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Build failed in Jenkins: stanbol-trunk #1646

See Changes: [rwesten] STANBOL-1450: added the new SupportedFormat#TEXT_RDF_NT constant for text/rdf+nt to the list of supported content types of the Entityhub. This ensures that text/rdf+nt is still supported by the Entityhub as RDF