Add release notes for Review Board 2.0 RC 2.

Review Request #5667 — Created April 1, 2014 and submitted — Latest diff uploaded

Information

Review Board
release-2.0.x
5c4acfe...

Reviewers

This contains the release notes for all changes made to 2.0 RC 2. It is,
fortunately, a smaller release than we're now used to.

Built the docs.