Add callout to docs: 3rd-party libs not supported

docs/javascript.html

@@ -64,6 +64,11 @@ $('#myModal').on('show.bs.modal', function (e) {
   if (!data) return e.preventDefault() // stops modal from being shown
 })
 {% endhighlight %}
+
+    <div class="bs-callout">
+      <h4>Third-party libraries</h4>
+      <p><strong>Bootstrap does not support third-party JavaScript libraries</strong> like Prototype or jQuery UI. Despite <code>.noConflict</code> and namespaced events, there may be compatibility problems that you need to fix on your own.</p>
+    </div>
   </div>