Merge pull request #3 from jimkont/wikidata

various changes
added wikipage extractor
various changes by dimitris
changed updated ArticlePageExtractor in prop file
fixed issues in Sever Module to deal with Parser -> Option
fixed bugs in server module due to chainging Extractor[PageNode] to Extractor[WikiPage]
import scala.language.reflectiveCalls
adapt for the new parser output
remove obsolete classes
throw exception on parsing error