Add jshint.com to real-world uses

index.html

@@ -107,6 +107,7 @@
       <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>
       <li><a href="http://bluegriffon.org/">BlueGriffon</a> (HTML editor)</li>
+      <li><a href="http://www.jshint.com/">JSHint</a> (JS linter)</li>
      </ul>
 
   </div></div>