Add Groups Object models

[eaquigley]

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Author Name: Michael Bar-Sinai (@michbarsinai)
Original Redmine Issue: 3500, https://redmine.hmdc.harvard.edu/issues/3500
Original Date: 2014-02-03
Original Assignee: Michael Bar-Sinai

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Groups are sets of users defined per dataverse. Groups can get roles and are inherited the same way permissions are.

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Related issue(s): #700
Redmine related issue(s): 4156

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[eaquigley]

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Original Redmine Comment
Author Name: Gustavo Durand (@scolapasta)
Original Date: 2014-03-10T22:41:09Z

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Not really sure what happened with this ticket, but it got moved around a bunch. Michael, can you review?

When done it should go to QA and they will test and mark as completed (or pass back to you).

[eaquigley]

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Original Redmine Comment
Author Name: Michael Bar-Sinai (@michbarsinai)
Original Date: 2014-03-18T17:54:08Z

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Discussion of features underway in at
https://docs.google.com/document/d/1P4HOUuJEoPfU06-4R9xP0nRFapNyZUg5xnjYNVRvFik/edit