An ActiveRecord::RecordNotUnique occurred in users#update:

 Mysql2::Error: Duplicate entry 'jack.repenning@akamai.com' for key 'index_users_on_email': UPDATE `users` SET `email` = 'jack.repenning@akamai.com', `updated_at` = '2014-06-03 00:05:14' WHERE `users`.`id` = 6
 app/controllers/users_controller.rb:84:in `block in update'
