Commented Feature: Support stored procs, functions [15]

Support the following (with immutable classes for results):

* Stored procedures
* Functions
Comments: Simon, Can you elaborate a bit please? How can I use a stored proc to get my data from the database to fill a POCO item? My proc is called GetCustomer(int @CustomerID) I see I can use the MapToStoredProcedures to set my Insert, Delete and Update, but I don't see a way to set it for the fetch. Thanks