Only the check owner or restaurant owner can see a particular check.
Restaurant show page with authorized owner dashboard; old receipts based on scope of not-nil paid_at attribute of check
Pay now button view disappears if check is closed. Should add controller filter
User can delete items on a bill. Math updates dynamically. Need to add authorization for POS only and delete to disappear after check is closed.
Destroy action is both hidden and filtered by the controller unless the user is the restaurant owner.
Only the owner of a check can use the Pay action in the Check controller. POS can still see the Pay button in the view.
Merge branch 'master' of https://github.com/atabas/dineXdash