Inline Analytics

  Display of answer distribution graphics inline on the problem page
  for instructors.

  Problem types supported for graphics:
    - MultipleChoiceResponse
    - ChoiceResponse

  Problem types supported for line item display:
    - OptionResponse
    - NumericalResponse
    - StringResponse
    - FormulaResponse
    via setting

Internal review only for now.
This is meant to be configurable, isn't it? If so, then rather than dev.py, I think you want an entry at the bottom of aws.py that pulls these values out of the *.envs.json files to override the defaults in common.py. If you do that, I don't think you need anything in dev.py, because I think dev.py imports from aws.py. (or maybe I'm thinking of devstack.py. But I think the comment about using aws.py stands.)