add support for decoding utf8 tokens

Author: jfromaniello

dist/css/app.css

@@ -12,7 +12,7 @@
     <script type="text/javascript" src="//use.typekit.net/iws6ohy.js"></script>
     <script type="text/javascript">try{Typekit.load();}catch(e){}</script>
 
-    <link rel="stylesheet" href="dist/css/app.css" media="all">
+    <link rel="stylesheet" href="dist/css/app.css" media="all"/>
     <link rel="search" type="application/opensearchdescription+xml" title="JWT.io" href="/opensearch.xml">
 
     <!-- Bootstrap core CSS -->

dist/js/app.js

@@ -24,7 +24,12 @@ function url_base64_decode(str) {
     default:
       throw 'Illegal base64url string!';
   }
-  return window.atob(output); //polifyll https://github.com/davidchambers/Base64.js
+  var result = window.atob(output); //polifyll https://github.com/davidchambers/Base64.js
+  try{
+    return decodeURIComponent(escape(result));
+  } catch (err) {
+    return result;
+  }
 }
 
 window.decode = function (base64json) {