Fixed a bug where lda training could not be executed again
Add Documents to corpus through AddArticleServlet
Integratet AddArticleServlet
Fixed a bug where datamodel was not referenced correctly
Refactored some code
DeleteArticleSevlet added
Added termFrequency capping parameter to LDARecommenderConfig
TopicDistribution are now printed out
Fixed a bug where FromFileVectorizer Jobs where not registered
Fixed a bug where document topic inference did not work correclty
Vactorizer now use tf-idf  vectors
added StopwordFilter class/tests, stopword list, added configuration attribute <trainingset>stopwords</trainingset>; when adding articles multiple training sets are generated, pure and stopwords