v2.3.0

New Features:

• Adds event publishing to message bus:
  • WeightLastSaveEvent;
  • HeightLastSaveEvent.
• Adds Awakenings task;
• Adds patients.sleep.durations endpoint;
• Changes patient_id references to user_id in Fitbit event handlers;
• Adds docker-compose.yml file;
• Updates Dockerfile;
• Updates .travis.yml;
• Updates versions of the project dependencies.