Add Order.TotalPaid field, the value is set when payment succeeded
Merge branch 'master' of https://github.com/Kooboo/Ecommerce

Conflicts:
	src/Modeling/Kooboo.Commerce.Modeling/ModelDefinition/Kooboo.Commerce.Modeling.uml
	src/Modeling/Kooboo.Commerce.Modeling/shopping.activitydiagram
	src/Modeling/Kooboo.Commerce.Modeling/shopping.activitydiagram.layout