remove extracted_slot stuff https://github.com/RasaHQ/roadmap/issues/263
remove extracted_slot stuff https://github.com/RasaHQ/roadmap/issues/263

RasaHQ/rasa_nlu,RasaHQ/rasa_core,RasaHQ/rasa_core,RasaHQ/rasa_core,RasaHQ/rasa_nlu,RasaHQ/rasa_nlu