The text shown for the body top/bottom fields on a review are no longer

fully static. When an API call is performed and the fields change in the

model, the review will re-render those fields.
To make this work, the ReviewModel resource class now tracks

HTML-rendered fields, along with the Markdown and raw fields, and the

ReviewView ensures that HTML is an included text type in responses. The

view then listens for changes on the raw fields and updates the page

based on the HTML fields.
Unit tests have been added to ensure this all works properly.

Unit tests pass.
Tested along with an in-progress change and saw that the body text had

properly updated on model changes.