Fixed that parentViewController was not set on child controllers if IIViewDeckController is the window root.
Removed swizzling of UIViewController's present(Modal)ViewController which breaks UIViewController's presentingViewController property and thereby modal unwind segues.
iOS 5+ uses UIViewController's definesPresentationContext property to determine which controller is parent for a modal view controller. That system should handle presentation just fine even without swizzling.
Merge remote-tracking branch 'origin/fix-present-view-controller'
Fixed that _shadowLayer was not added to the layer hierarchy if the delegate implements viewDeckController:applyShadow:withBounds:.
Merge branch 'fix-shadow-layer'
Significantly improved panning performance when not using centerViewCornerRadius at all by not applying a mask to the IIViewDeckView.

Applying a mask to IIViewDeckView is a really bad idea in any case because it significantly hurts drawing performance!
Corrected intendation: tabs -> spaces
Merge branch 'fix-shadow-layer'
Merge remote-tracking branch 'origin/fix-non-corner-radius-performance'