Add an API for deleting review groups.

Review Request #2616 — Created Sept. 24, 2011 and submitted — Latest diff uploaded

Information

Review Board
release-1.6.x

Reviewers

Add an API for deleting review groups.

Until now, we've only had GET support for review groups in the API. Now that I'm
trying to make a fancy UI for managing groups, I'd like to be able to delete
them as well (no edit, yet). This change adds said API, along with unit tests.
Ran tests.