Revert "fix spelling"

Reverts Injac/ExGrip.WinRT.AppBarControls#5 - Looks like the refactoring has removed some important using statements. Reverting, please update and re-issue after you have tested your changes. Thanks :)

Error	1	The type or namespace name 'TransitionCollection' could not be found (are you missing a using directive or an assembly reference?)	App.xaml.cs	17
Error	2	The type or namespace name 'NavigationEventArgs' could not be found (are you missing a using directive or an assembly reference?)	C:\Users\Ilija\documents\visual studio 2013 App.xaml.cs	105