Schema for a Group object
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### What's a Group object for?

The Group object stores information for a given group.
A Group consists of an `id`, `name` and array of `email addresses`.

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### Schema for a Group object

    {
      id: (string),
      appId: (string),
      name: (string),
      members: (set)
    }

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### Schema description

  * id, a string idenfier
  * appId, the appId which created this group
  * name, the name of the group
  * members: a set of email addresses who belong to this group

[User]: http://theopenphotoproject.org/documentation/schemas/User
[Photo]: http://theopenphotoproject.org/documentation/schemas/Photo
[Action]: http://theopenphotoproject.org/documentation/schemas/Action