[zanata/zanata-server] cfe609: Add admin role assignment doc

[GitHub]

  Branch: refs/heads/role-assignment
  Home:   https://github.com/zanata/zanata-server
  Commit: cfe609645f559ebf6cf575a481b75cca4cbb77ff
      https://github.com/zanata/zanata-server/commit/cfe609645f559ebf6cf575a481b75cca4cbb77ff
  Author: Alex Eng <aeng at redhat.com>
  Date:   2015-05-05 (Tue, 05 May 2015)

  Changed paths:
    A docs/images/role-assignment-access.png
    A docs/images/role-assignment-delete.png
    A docs/images/role-assignment-new-access.png
    A docs/images/role-assignment-new-form.png
    A docs/images/role-assignment-project.png
    A docs/images/role-assignment-view.png
    M docs/user-guide/admin/admin-overview.md
    A docs/user-guide/admin/role-assignment-rules.md
    M mkdocs.yml

  Log Message:
  -----------
  Add admin role assignment doc