Added fallback to CoreNLP server.
First implementation of a method which gets back the governing verb for a non-verb.
When returning governing verb also look for an aux of the governing verb. Also return POS of verb and aux.
Improved error message.
Activated the nlp persistence layer for the dependency feature; Unfortunately tHere are still many uncached sentences.
Implemented drive-by caching of sentences which are not yet in the cache.