Removed the Bordered Toolbar setting. 

Fixes a range exception in the settings controller.
Initial work on the new kiosk view controller transitions.

Needs further refinement.
Removed outdated code.
De-registering UINavigationBarDelegate.
Removed PSCShadowView from the grid controller.
Removed PSCShadowView.
Improved PSCKioskPDFViewController close button.

Not show the appropriate button style based on how the controller was presented (from kiosk, or otherwise).
Using springy animations for the kiosk grid.
Falling back to crossfade animations if the zoom animations can't be performed.
Removed a legacy navigation-bar animation and a few non-crucial TODOs.
Merge pull request #35 from PSPDFKit/matej/UI-modernization-and-fixes

[WIP] UI modernization and fixes