Add support for resource URIs (<http://example.org/class>) to Graph->isA resp. Resource->isA methods
Add tests for 4fd11e0d88b9b6e908df8c4ffcc07116871a3a2a

Rename other isA tests and add one for the "<URI>" notation
Merge pull request #215 from white-gecko/master

Add support for resource URIs (<http://example.org/class>) to Graph->isA...