Use versioned assets for p5.js and p5.sound.js files

Author: limzykenneth

src/templates/pages/reference/index.hbs

@@ -27,8 +27,8 @@ slug: reference/
   </div> <!-- end column-span -->
 
   <script src="//fast.fonts.net/jsapi/5ace315e-3b19-4568-9e85-5bfcb29004c0.js"></script>
-  <script src='/assets/js/p5.min.js'></script>
-  <script src='/assets/js/p5.sound.min.js'></script>
+  <script src='{{#versionedAsset}}assets/js/p5.min.js{{/versionedAsset}}'></script>
+  <script src='{{#versionedAsset}}assets/js/p5.sound.min.js{{/versionedAsset}}'></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.3.3/backbone-min.js"></script>
   <script src="/assets/js/vendor/require.min.js"></script>