[ touch handle for autoplay ]

Allows interruption of caroulse while swiping/touching
- properly address: kenwheeler#884
- closes kenwheeler#884
- fixes kenwheeler#1694

slick/slick.js

@@ -2408,6 +2408,7 @@
             slideCount;
 
         _.dragging = false;
+        _.interrupted = false;
 
         _.shouldClick = (_.touchObject.swipeLength > 10) ? false : true;
 
@@ -2565,6 +2566,8 @@
         var _ = this,
             touches;
 
+        _.interrupted = true;
+
         if (_.touchObject.fingerCount !== 1 || _.slideCount <= _.options.slidesToShow) {
             _.touchObject = {};
             return false;