0.16.0

Changed

• The SnipsNLUEngine object is now persisted to (and loaded from) a
  directory, instead of a single json file.
• The language resources are now persisted along with the SnipsNLUEngine,
  removing the need to download and load the resources when loading a trained engine.
• The format of language resources has been optimized.

Added

• Stemmed gazetteers, computed beforehand. It removes the need to stem
  gazetteers on the fly.
• API to persist (and load) a SnipsNLUEngine object as a bytearray

Fixed

• Issue in the DeterministicIntentParser when the same slot name was used in
  multiple intents while referring to different entities