Updated DbpediaFether and TomitaFactsExtractor to new VocabularyEntry scheme and to be updateable
Deleted uniqueness of url validation in Metadata. Some updates in VocabularyEntry
Fixed url setting on TomitaFactsExtractor
Updated xml and json generation - now more pretty
Some refactor
Updated OsmFetcher - now its not bad and it can be updateable like DbpediaFetcher and TomitaFactsExtractor
Created data_fetcher.rake to easy manage data fetching