Adding option to disable scroll navigation

Fixes #66

src/js/modules/webslides.js

@@ -36,6 +36,7 @@ export default class WebSlides {
    * @param {boolean} loop Whether to go to first slide from last one or not.
    * @param {number} minWheelDelta Controls the amount of needed scroll to
    * trigger navigation.
+   * @param {boolean} navigateOnScroll Whether scroll can trigger navigation or not.
    * @param {number} scrollWait Controls the amount of time to wait till
    * navigation can occur again with scroll.
    * @param {number} slideOffset Controls the amount of needed touch delta to
@@ -46,6 +47,7 @@ export default class WebSlides {
     changeOnClick = false,
     loop = true,
     minWheelDelta = 40,
+    navigateOnScroll = true,
     scrollWait = 450,
     slideOffset = 50
   } = {}) {

src/js/plugins/scroll.js

@@ -40,6 +40,11 @@ export default class Scroll {
      */
     this.timeout_ = null;
 
+    // Disabling from option
+    if (!this.ws_.options.navigateOnScroll) {
+      return;
+    }
+
     if (!MobileDetector.isAny()) {
         this.scrollContainer_.addEventListener(
             'wheel', this.onMouseWheel_.bind(this));