Fixed issue #1: Collapsed and Exposed layouts honor collectionView's contentInsets now, so that the view controller behaves properly when inside a UINavigationController.
StackedViewController initializes property default values on init, not on viewDidLoad.
Sample project shows StackedViewController in different scenarios

* As a stand-alone VC as before (use double tap to close)
* Embedded in a UINavigationController
* Embedded in a UINavigationController with ToolBar
* Embedded in a UINavigationController but without extended edges
Fixed sample project's class prefix