Ensure we call authorize! :admin in admin controllers
Adding additional common Bogus Credit Card Numbers

Fixes #2543
FlatPercentItemTotal calculator should only care if the object responds to item_total

Whenever a line item is added to an order, the item_total is updated anyway.
Let's re-use that value in this calculator, rather than recalculating it here.
Merge remote-tracking branch 'railsdog/master'