Added the ignore directive for classes/ directory.
Updated LanguageEnglish and LanguageDutch classes to use OpenNLP 1.5.3. Removed LanguageSpanish language model class. Commented out multi-threaded section in TextRank class so that its call method is run directly. I had to add English WordNet files under res/nl/wn because otherwise the system did not run (it looks for WordNet files, even if it will not use it if the language is other than English). Did minor code re-formatting and cleanup.