Added Jena test that relies on Fuseki

Jena SPARQL update test on a Fuseki embedded server. 

@betehess I promised this a few days ago ;-)
I am being picky, but can you specify the return type of the method? You may object and I won't bother you more with that (this rule is written nowhere yet, we are still working on guidelines), this is just to achieve a more consistent style.