v4.0.0

Added

• setEndButtonVisible and setBackButtonVisible methods in StepViewModel.Builder for toggling button visibility (issue #104)
• New stepper type none which shows no progress indicator for the steps (issue #154)
• New stepper feedback type disabled_content_interaction which intercepts touch events on the steps' content and ignores them during operation.
• New stepper feedback type content_overlay which shows a dimmed overlay over the content.
• An option to specify the background drawable for content_overlay stepper feedback type via ms_stepperFeedback_contentOverlayBackground.
• An option to specify the fade out alpha for content_fade stepper feedback type via ms_stepperFeedback_contentFadeAlpha attribute.

Changed

• Breaking change: Updated Android Support Library version to 25.4.0 to support vector animations without a pre-Lollipop fallback (issue #154)
• Breaking change: Changed setNextButtonLabel methods in StepViewModel.Builder to setEndButtonLabel so that it works for both Next and Complete buttons (issue #107)
• Breaking change: Split content stepper feedback type into content_progress and content_fade.