* [XML_STREAM,SC] Small simplification of code.
* [XML_TO_RDF,EXT] Resources are now named by using the given primary properties.
* [XML_TO_RDF,O] Optimized greatly by dropping the check for existing resource (old code still included in comments).
* [XML_TO_RDF,SC] Simplified the code considerably.
Merge branch 'master' of https://github.com/wouterbeek/PGC