CB-2500: handle multiple concurrent alerts

Walk up the parent's chain of OK buttons until we meet the NotificationBox
object and remove that object from the root grid.
remove some differences between template project variable naming, rename some gap references
Merge pull request #15 from purplecabbage/CB2821

remove some differences between template project variable naming, rename...
Merge branch 'CB-2500' of git://github.com/cmarcelk/cordova-wp8 into CB-2500
Merge pull request #16 from purplecabbage/CB-2500

Cb 2500