Pyramid-skosprovider

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- Return an HTTP 404 response when a conceptscheme could not be found. (24)
- Add universal wheel distribution. (23)
- Add support for sorting on a SortLabel. This means a client can now ask to
sort the results either on `id`, `label` or `sortlabel`. See the
`skosprovider` docs for more on the `sortlabel`. This basically allows for
arbitrary sorting per language so it's possible to eg. sort Historical
periods chronologically. (26) [cahytinne]

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- Sort case insensitive when sorting by label. This is a BC break, although
to most users it might actually be a bug fix. (16) [TalissaJoly]
- Add the markup attribute to Note json representations. This is a new addition
to skosprovider 0.6.0 that allows marking that a note contains some markup
(currently only HTML).
- Looking for a certain URI is now done with a query parameter in stead of in
the path of a resource. So, `/uris/urn:x-skosprovider:trees` should now be
called as `/uris?uri=urn:x-skosprovider:trees`. The old way is deprecated. It
will still function under version `0.7.0`, but will be removed in a future
version. (19)
- Add support for the sources attribute, a new feature in skosprovider 0.6.0
- Add support for languages to Conceptschemes, a new feature in skosprovider
0.6.0 that allows detailing what languages a conceptscheme uses.
- Move JSON renderers to their own file and fix some language handling issues.
(22)
- Add support for Python 3.5

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- Allow the client to specify in which language labels should preferentially
be returned. This can be chosen by adding a ``language`` parameter to
certain query strings. If not present, pyramid_skosprovider falls back on
pyramid's locale negotiation. (10) (14) [dieuska]
- Expose a provider's expand method. This returns the narrower transitive
closure for a certain concept or collection. (11) [dieuska]
- Some documentation updates.

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- Conceptschemes expose information on the subject they're tagged with. [BartSaelen]
- A new search endpoint for searching across conceptschemes was added. Search
syntax is the same as for searching within a single scheme, but the collection
parameter is not accepted. Two extra parameters were added for limiting the
search to a subset of available conceptschemes. (8)
- A new endpoint for looking up a certain URI was added. This endpoint does not
redirect to an external URI, but lets a client know where more information
about this URI can be found (eg. in which conceptscheme a concept lives). (7)

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- Compatibility with skosprovider 0.4.0
- Drop support for Python 2.6 and Python 3.2.
- Expose notes on collections.
- Expose matches on concepts (collections don't have matches).
- Expose subordinate_arrays on concepts and superordinates on collections.
- Integrate concept scheme information. Concepts and collections passed through
the service now contain the uri of the concept scheme they belong to. The
concept scheme endpoint now also exposes information like a uri, a list of
labels and notes.

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- Expose information about top concepts.
- Expose information about display top and display children.
- Fix a bug with returning concepts and collections not on the first page
of data through the Range header. (3)
- Added support for sorting. (4, 5) [cedrikv]