use "wikidata" prefix, not "wd"

we already do this on the dump branch and on the mappings wiki, since the dbpedia server is using the dump branch code
Add map of equivalent Classes / Properties in Ontology
add ontologyUpdateFeeder launcher
skip unnecessary logging
minor updates in OntologyUpdateFeeder
Support for new label/comment mappings syntax  (copied from Mohamed's uncommitted code)
Merge remote-tracking branch 'upstream/master'