remove num_hidden_layers, refactor tf helper methods to create embeddings
remove num_hidden_layers, refactor tf helper methods to create embeddings

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