dropdown-toggle should be a button, not an anchor

Created by: ForbesLindesay

The example code in the documentation includes a dropdown menu:

<li class="dropdown">
  <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
  <ul class="dropdown-menu">
    <li><a href="#">Action</a></li>
    <li><a href="#">Another action</a></li>
  </ul>
</li>

Since all the a.dropdown-toggle is doing is triggering a JavaScript action, it is not a link and should instead be a button (i.e. button.dropdown-toggle) but that looks wrong when you use it in bootstrap.