Mir 1.0 Is Pulled Back, Now It's Mir 0.28

While we've long been told that Mir 1.0 would happen for Ubuntu 17.10 -- even as recently as last month -- and then earlier this week was a Mir 1.0 tag and the v1.0.0 milestone in Launchpad, that version is being pulled back in favor of calling it Mir 0.28...