v1

Fixes janheinrichmerker#135

Update .travis.yml

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Behavior change: page scroll change now reacts to the distance to scr…

…oll to implement https://material.google.com/motion/duration-easing.html#duration-easing-dynamic-durations (check https://github.com/HeinrichReimer/material-intro/blob/master/library/src/main/java/com/heinrichreimersoftware/materialintro/app/IntroActivity.java#L343 for the exact formula)

Fixed bug when switching pages before the current page change animation is finished

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Updated demo APK

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