removed Node constructions

- replaced Node.createURI with Nodefactory.createURI
NodeMeasureDatum --> NodeTripleMeasureDatum; new NodeMeasureDatum

- renamed NodeMeasureDatum to NodeTripleMeasureDatum
- created new NodeMeasureDatum class
- updated all classes using the one or the other accordingly
removed own resource constants with Jena constants

- removed all these declared resource and property constants with the
  appropriate Jena constants
- fixed wrong resources: rdfs:Propery --> rdf:Property
fixed wrong constant in NoResourceNameClashesTest

- rdfs:Property --> rdf:Property
added TypedResources metric + tests
added forgotten renamed NodeTripleMeasureDatum
updated wrong comment in TypedResources