Add benchmark page and initial data

_includes/header.html

@@ -20,6 +20,7 @@
         <li><a href="http://www.iotjs.net">Powering <b>IoT.js</b></a></li>
       </ul>
       <ul class="nav navbar-nav navbar-right">
+        <li><a href="benchmark/benchmark.html" >Benchmark</a></li>
         {% for p in site.pages %}
           {% if p.title %}
             {% if page.url == p.url %}