[WIP] Custom review request fields

Review Request #8111 — Created April 10, 2016 and discarded — Latest diff uploaded

Information

Review Board
release-2.5.x

Reviewers

This is a WIP review request for the student project to add custom review request fields.
It does not have any salvagable parts, as of now it is all experiemental.

In the future I will be modifiying the BaseReviewRequest class to add initial values in the
data-raw-value attribute of the field. This will likely solve the problem of not being able
to load and publish custom fields.

None, yet. Still need to write unit test.