[CB-4850] only write device guid if it does not exist
[CB-3621] backbutton events can now throw an exception to let the native side know that it should exit the app
[CB-3621] backbutton events can now throw an exception to let the native side know that it should exit the app (WP7)
CB-4872: Added wp7 and wp8 sdk version
CB-4872 - added os version and edition check
CB-4872 changed version script file location to right spot and modified sdk version output