Reworking of tox and test-suite.
Update to skosprovider 0.2.0dev

Make the interface compatible with 0.2.0dev and include searching for
just concepts or just collections.
Implement find in collection.

Implement searching in a certain collection. Since the service doesn't
support this directly, this filtering is done locally. Works well for
smaller thesauri and is best used in combiantion with a query for a
label.
Tear down providers in unittest.
Mark as version 0.2.0a1
Getting ready for version 0.2.0.
Merge pull request #1 from koenedaele/zerotwo

Zerotwo