Default IOrderRepository implementation does not call ICouponUsage.Report method

Description

Steps to reproduce

1. Use latest version of Commerce in a Quicksilver project.
2. Implement ICouponUsage as described here: http://world.episerver.com/documentation/developer-guides/commerce/marketing/coupons/

For example:

    public class CustomCouponUsage : ICouponUsage
    {        
        public void Report(IEnumerable<PromotionInformation> appliedPromotions)
        {
            Console.WriteLine("test");
        }
    }

1. Place an order

Actual: the ICouponUsage.Report method is never called.