Fixed #465.
Fixed #465.

 - slideWidth used trackWidth directly in calculations, but this.track is not the same thing as this.

akiran/react-slick,BenjaminNeilDavis/react-slick,asmpx/react-slick-asmpx,harklee/dotsaway-react-slick,sanbornmedia/react-slick,teaualune/react-slick