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.
Since we're not using the 2nd or 3rd parameters, we can go ahead and
remove them from the declaration.
```javascript
error: function(jqXHR) {
    // ...
}
```