allow pointerdown handler to be changed

Author: Graham Butler

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@author.io/element-slider",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "description": "author-slider custom element (web component).",
   "main": "dist/author-slider.min.js",
   "scripts": {

showroom/dist/css/main.css

@@ -1,6 +1,6 @@
 /**
  * author-slider-showroom v1.0.0 generated on Tue Aug 06 2019.
- * Built at 18:08:40 GMT-0700 (Pacific Daylight Time)
+ * Built at 18:18:19 GMT-0700 (Pacific Daylight Time)
  * Copyright (c) 2019 Author.io
  */
 "use strict";var Demo=new NGNX.VIEW.Registry({selector:".demo",namespace:"demo.",references:{slider:"author-slider",handle:"author-slider-handle"},init:function(){var e=this.ref,o=e.slider;e.handle;window.slider=o.element,o.on("slide",function(e){console.log("SLIDE"),console.log("POSITION:",e.detail)}),o.on("change",function(e){console.log("CHANGE"),console.log("PREVIOUS:",e.detail.previous),console.log("NEW:",e.detail.position)})}});