[stylus mode] Added tabSize and link to the author in demo page

mode/stylus/index.html

@@ -28,8 +28,9 @@
 <h2>Stylus mode</h2>
 <form><textarea id="code" name="code">
 /* Stylus mode */
-#id
-.class
+
+#id,
+.class,
 article
   font-family Arial, sans-serif
 
@@ -96,9 +97,10 @@ a:focus {
 <script>
   var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
     extraKeys: {"Ctrl-Space": "autocomplete"},
+    tabSize: 2
   });
 </script>
 
 <p><strong>MIME types defined:</strong> <code>text/x-styl</code>.</p>
-
+<p>Created by <a href="https://github.com/dmitrykiselyov">Dmitry Kiselyov</a></p>
 </article>