ATPagingView setGapBetweenPages found bug and fix, just add this code.

[OlehKulykov]

1. When ATPagingView is created you applying scroll view frame like: "_scrollView.frame = [self frameForScrollView];"
2. When you getting frame for the page using scrollView frame sizes.
   But if set gap (ofcource after creation ATPagingView) you don't change scrollView frame.
   So add "_scrollView.frame = [self frameForScrollView];" to method named: "- (void)setGapBetweenPages:(CGFloat)value"