added UI notifications if a build is flagged as broken

In light of our conversation today, what do y'all think of this error text?

> "One or more of your versions is broken, please make sure it is not marked as released.  Make a new version if needed, and update any live deployments as soon as possible."  "All new versions should work, so if problems persist, please report the issue."

fixes: http://manage.dimagi.com/default.asp?69701