Removed PSPDFAnnotationToolbar.
Re-added and updated a few toolbar configuration options.
Added an updated version of PSCCustomAnnotationToolbarButtonsExample.
Added an updated version of PSCCustomAnnotationToolbarButtonsExample.
New PSCVerticalAnnotationToolbarExample based on PSPDFAnnotationStateManager.
Merge pull request #29 from PSPDFKit/matej/iOS6-purge-fixes

[READY] iOS 6 purge and related fixes