Dumps and initial training set

Here we have
* scripts that create dumps of Wikidata/DBPedia classes and properties;
* basic matchers;
* script that creates CSV files with mappings based on exact label matcher (this file is used to make initial training set).
This seems to have changed too. A correct URL now looks like ```http://tools.wmflabs.org/wikidata-exports/rdf/exports/20140526/wikidata-taxonomy.nt.gz```