Support Content-Negotiation for serving ontologies

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Github pages does not support content negotiation, so one should put a proxy between purl.org and github.io that delegates to turtle or owl files.

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RDF ontologies should be detected at least by http://lov.okfn.org/dataset/lov/suggest/

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Since version 0.68, a link is added to the HTML output, as suggested by http://www.w3.org/TR/rdf-syntax-grammar/#section-rdf-in-HTML:

<link rel="alternate" type="application/rdf+xml" href="filenamename.owl" />

I wonder which application makes use of this link. I guess that most parsers expect RDFa and ignore the header :-(