9.1.2 green unsuccessful edits
9.1.3 green successful edits
9.2.1 green requiring signed-in users
9.2.2 green requiring the right user
9.2.3 green friendly forwarding
9.3.1 green user index
9.3.2 load sample users
9.3.3 gree pagination
9.3.4 green partial refactoring
9.4.1 green admin users
9.4.2 green the destroy action
instantiate admin within sample data