Add link to Elm interactive examples

Author: marijnh

index.html

@@ -102,6 +102,7 @@ <h2>Real-world uses:</h2>
       <li><a href="http://www.wescheme.org/">WeScheme</a> (learning tool)</li>
       <li><a href="http://webglplayground.net/">WebGL playground</a></li>
       <li><a href="http://ql.io/">ql.io</a> (http API query helper)</li>
+      <li><a href="http://elm-lang.org/Examples.elm">Elm language examples</a></li>
      </ul>
 
   </div></div>