ContextProvider.cs: Extracted InitializeSaveState method from SaveChanges so can translate SaveBundle->SaveMap w/o saving
Modified NorthwindIBModelController.SaveWithExit so can see the method at work independent of SaveChanges.
All tests pass.
Inspired by http://stackoverflow.com/questions/21691579/uninitialised-jsonserializer-in-breeze-savebundletosavemap-sample