Convert RB.ReviewReply to Backbone.

Review Request #3950 — Created March 8, 2013 and submitted — Latest diff uploaded

Information

Review Board
master

Reviewers

Convert RB.ReviewReply to Backbone.

This is another relatively simple conversion for the data model for ReviewReply
objects to be based on BaseResource.
Replied to an existing review with body_top, body_bottom, and children
CommentReply objects. Published that reply and saw it get saved correctly.
Verified that loading a draft reply worked as expected. Ran js-tests.