As Shredmil mentioned above, Bootstrap does require jQuery. Make sure it's included ABOVE bootstrap.min.js
.
//css bootstrap
<link href="bootstrap-3.1.1-dist/css/bootstrap.min.css" rel="stylesheet">
//js bootstrap
<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
<script type="text/javascript" src="bootstrap-3.1.1-dist/js/bootstrap.min.js"></script>