Skosprovider-rdf

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- Compatibile with `SkosProvider 0.7.0 <http://skosprovider.readthedocs.io/en/0.7.0/>`_.
- Make it possible to read an RDF file containing more than one conceptscheme. (35)
- Drop support for Python 3.3, 3.4 and 3.5. This is the last version that will
support Python 2. (63)

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- Compatibile with `SkosProvider 0.6.1 <http://skosprovider.readthedocs.io/en/0.6.1/>`_.
- Add information about the void.Dataset when dumping to RDF.

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- Compatibile with `SkosProvider 0.6.0 <http://skosprovider.readthedocs.io/en/0.6.0/>`_.
- Add official python 3.5 compatibility.
- Add support for sources when dumping to RDF and reading from RDF. (17)
- Add support for languages to conceptschemes when dumping to and reading from
RDF. (16)
- Add support for HTML in SKOS notes and sources. (15, 20)

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- RDF dump: Add the top concepts and the conceptscheme identifier in the full RDF dump
(equal to the RDF conceptscheme dump).
- RDF provider: literal and binary type to text when parsing the graph to a list.

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- Allow dumping a single conceptscheme to RDF. This does not dump the entire
conceptscheme with all it's concepts or collections, just information on the
conceptscheme itself and it's top concepts.
- Allow dumping a single concept or collection to RDF, and not just an entire
conceptscheme with all concepts or collections.
- Add skos:inScheme information to RDF dumps.
- Better handling of dc(t):identifier. When reading an RDF file both
dcterms:identifier and dc:identifier are considered when analysing the
identifier. During dumping, we also dump to dcterms:identifier.

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- Compatibile with `SkosProvider 0.5.0 <http://skosprovider.readthedocs.org/en/0.5.0>`_.
- Dumping to an RDF file now also dumps information on the Conceptscheme.
- Dumping to an RDF file now also adds notes to a Collection, not just to a
Concept.
- Now handles subordinate_array and superordinate concept.