use var for readability and ES5-familiarity

index.js

@@ -3,15 +3,15 @@ var each = require('async-each')
 var loadImage = require('img')
 
 // load our texture maps
-const names = ['diffuse', 'normal', 'specular']
-const urls = names.map(x => {
+var names = ['diffuse', 'normal', 'specular']
+var urls = names.map(x => {
   return `assets/brick-${x}.jpg`
 })
 
 each(urls, loadImage, (err, images) => {
   if (err) 
     throw err
 
-  const app = createApp(images)
+  var app = createApp(images)
   document.body.appendChild(app.canvas)
 })