Skosprovider-sqlalchemy

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* Update to skosprovider 0.4.0.
* Add :class:`~skosprovider.skos.ConceptScheme` information to a provider so it
can be attached to :class:`~skosprovider.skos.Concept` objects that are
handled by the provider.
* Let provider handle superordinates and subordinate arrays.
* Let provider add notes to collections.
* Added a :class:`~skosprovider_sqlalchemy.models.Match` model to handle
matches. Expand the provider to actually provide information on these matches.
* Expand the field length for language identifiers. IANA suggests that
identifiers up to 35 characters should be permitted. Updated our field length
to 64 to have a bit of an extra buffer.

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* Switch to py.test
* Add `Coveralls <https://coveralls.io>`_ support for code coverage.
* Add ability to configure the SQLAlchemy URL used for testing. Allows testing
on multiple RDBMS systems.
* Run `Travis <https://travis-ci.org>`_ tests for both SQLite and Postgresql.
* Fix a bug in :meth:`skosprovider_sqlalchemy.utils.import_provider` when
dealing with narrower collections (8). [cahytinne]
* Make the provider actually generate a :term:`URI` if there's none in the
database.

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* Compatibility with skosprovider 0.3.0
* Implement :meth:`skosprovider.providers.VocabularyProvider.get_by_uri`.
* Implement :meth:`skosprovider.providers.VocabularyProvider.get_top_concepts`.
* Implement :meth:`skosprovider.providers.VocabularyProvider.get_top_display`
and :meth:`skosprovider.providers.VocabularyProvider.get_children_display`.
* Add a UniqueConstraint(conceptscheme_id, concept_id) to Thing. (3)
* Rename the `colletions` attribute of :class:`skosprovider_sqlalchemy.models.Thing`
to `member_of`. (7)

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* Pinned dependency on skosprovider < 0.3.0
* Pass data to :class:`skosprovider.skos.Concept` using keywords in stead of
positions.

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* Fixed a bug with collection members being passed instead of their ids.
* Fixed another bug where model ids were used instead of concept ids.

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* Initial version
* Implementation of a SKOS domain model in SQLAlchemy.
* Implementation of a :class:`skosprovider.providers.VocabularyProvider` that
uses this model.
* Can query a hierarchy recursively or using nested sets.
* Utility function to import a :class:`skosprovider.providers.VocabularyProvider`
in a database.