implement OpenID+discussion

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

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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

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Is this redundant given support single sign-in packs?

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

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yeah, I'd say so. good call.

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