Add a test to test that the admin attribute is forbidden
Change some link to open on another tab/window
Add some tests
Remove the duplicated form code by refactaring the new.html.erb and edit.html.erb views
Add tests sigend-in users who access new and create in Users controller to redirect to root URL
Add a test to make sure that the friendly forwarding only forwards to the given URL the first time
Modify the destroy action to prevent admin users from destroying themselvs