Create a group of reviewers
Add method to find out if the user is part of the reviewers groups
Ask for admin and reviewer groups upon login
Specify in each template if the user is a reviewer
Allow reviewers and admins to the admin section
Restrict some endpoints to admins only (ie: not reviewers)
Only admins are allowed to edit an election
Admin section is accessible for admins and reviewers as well
If user is a reviewer and not an admin, show the review page as read-only
Put sysadmin-nuancier as admin instead of the whole designteam
Add tests to ensure only admins are allowed on some part of the admin section
Adjust error message as per @ralphbean advices
Fix the unit-tests as we adjusted the error message

This ought to be the most tested piece of code in the project :)
Merge pull request #51 from fedora-infra/reviewers

Reviewers