[zanata/zanata-server] 7fd931: docs(project-roles): add docs for project roles

[GitHub]

  Branch: refs/heads/project-roles-ui
  Home:   https://github.com/zanata/zanata-server
  Commit: 7fd9315a000d285771e06e63004594145d25e625
      https://github.com/zanata/zanata-server/commit/7fd9315a000d285771e06e63004594145d25e625
  Author: David Mason <drdmason at gmail.com>
  Date:   2015-09-03 (Thu, 03 Sep 2015)

  Changed paths:
    A docs/images/project-people-manage-permissions.png
    M docs/images/project-translation-settings.png
    A docs/images/project-view-people.png
    M docs/images/project-view-versions.png
    M docs/user-guide/languages/language-team.md
    M docs/user-guide/projects/project-settings.md
    A docs/user-guide/projects/project-team.md
    M docs/user-guide/projects/project-view.md
    M mkdocs.yml

  Log Message:
  -----------
  docs(project-roles): add docs for project roles

Includes a few modifications to related docs, and some updated screenshots
where the Maintainers tab was shown, since it has changed to the People tab.