implement OpenID+discussion

Meyer asked about this.  Paul Bloch wanted to know when we'd have it. 

removing from 1.0 because of scoring low on priority checklist, but let's get to it soon. Sam Rose also excited about it.

  --Ethan McCutchen.....Wed May 06 10:48:20 -0700 2009

Is this redundant given support single sign-in packs?

  --John Abbe.....2013-03-22 00:05:07 +0000

yeah, I'd say so. good call.

  --Ethan McCutchen.....2013-03-22 03:18:00 +0000