[ButtonCode] Update Xamarin.Forms package to 1.0.6188
[ButtonXaml] Update Xamarin.Forms package to 1.0.6188
[ClassHierarchy] Update Xamarin.Forms package to 1.0.6188
[GridLayoutDemo] Update Xamarin.Forms package to 1.0.6188
[LabelledSections] Update Xamarin.Forms package to 1.0.6188
[ScaleAndRotate] Update Xamarin.Forms package to 1.0.6188
[TabbedPageDemo] Update Xamarin.Forms package to 1.0.6188
[TipCalc] Update Xamarin.Forms package to 1.0.6188
[Xuzzle] Update Xamarin.Forms package to 1.0.6188
[Todo] Update Xamarin.Forms package to 1.0.6188