Remove travis build badge

Author: headius

_includes/menu.html

@@ -29,11 +29,6 @@
         <li id="page_15" class="{% if page.title contains "Security" %}on{% endif %}">
           <a href="/security">Security</a>
         </li>
-        <li>
-          <a href="https://travis-ci.org/jruby/jruby" target="_blank">
-            <img src="https://secure.travis-ci.org/jruby/jruby.svg?branch=master" alt="Build Status" />
-          </a>
-        </li>
       </ul>
     </div>
   </div>