StateViewControllerTransitioning
View controllers can conform to this protocol to provide their desired
state transitioning behaviour when contained in a StateViewController.
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                  Returns the animation duration for a state transition of this view controller. 
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                  Notifies that a state transition will begin for this view controller. 
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                  Notifies that a state transition did end for this view controller. 
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                  Animations performed alongside the state transition of this view controller. 
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                  Returns the animation delay for a state transition of the provided view controller. 
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           StateViewControllerTransitioning Protocol Reference
      StateViewControllerTransitioning Protocol Reference