DeckServiceUtil: added method for getDeckTitle, for methods getSlideTitle/getSlideContent: check if they are set in given node, changed 2 private methods to public
DeckServiceUtil: added method for getDeckTitle, for methods getSlideTitle/getSlideContent: check if they are set in given node, changed 2 private methods to public

slidewiki/nlp-service,slidewiki/nlp-service,slidewiki/nlp-service,slidewiki/nlp-service