Update the CreateFreebaseLinks based on the new Freebase RDF dump format

This should fix issue #24.
Updated the freebase regex to find mid and wikipedia key in order to link freebase entity to the corresponding one in dbpedia.
New Freebase RDF dump files are downloadable from [1] 
The description of the format in [1] slightly differs from the actual one.
Example line:
ns:m.010gkk	ns:type.object.key	"/wikipedia/en/Fort_Duchesne".

[1] https://developers.google.com/freebase/data