added reference to bootstrap CSS

Author: jadianes

src/main/webapp/index.html

@@ -189,6 +189,7 @@ <h3 class="about"><a href="//www.ebi.ac.uk/about">About us</a></h3>
 <script src="//ajax.googleapis.com/ajax/libs/chrome-frame/1.0.3/CFInstall.min.js"></script>
 <script>window.attachEvent('onload',function(){CFInstall.check({mode:'overlay'})})</script>
 <![endif]-->
+<link data-require="bootstrap-css@*" data-semver="3.0.0" rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" />
 
 <link rel="stylesheet" href="app.css">
 <link rel="stylesheet" href="mini-bootstrap.css">