Execute multiple actions with a Given or When method

[Galad]

Instead of doing

Actor.Given(Add.TheItem("Buy milk"));
Actor.Given(Add.TheItem("Buy bread"));

We could do

Actor.Given(
         Add.TheItem("Buy milk"),
         Add.TheItem("Buy bread")
         );

(Same principle applies to When)

This can be an extension method of IActorFacade.