Add release notes for 2.0.6.

Review Request #6249 — Created Aug. 20, 2014 and submitted — Latest diff uploaded

Information

Review Board
release-2.0.x
08ad0df...

Reviewers

This covers all the fixes and improvements made since 2.0.5.

Built the release notes. Saw the link worked in the list of versions,
and saw that the page rendered fine.