Removed double tap mode from WPWalkthroughOverlayView
Renamed dismiss completion block of WPWalkthroughOverlayView
Modified dismissal behavior of WPWalkthroughOverlayView
Re-styled WPNUXMainButton
Re-styled WPNUXSecondaryButton
Re-styled WPNUXPrimaryButton
Removed description from first screen of NUX