[2.0-wip] Dropdown toggle class breaks button group

Created by: matharden

http://jsfiddle.net/matharden/zDx2n/

When I add .dropdown-toggle to an <a> which is part of a .btn-group it adds rounded corners on the right.

I'm trying to add multiple drop downs to these buttons which change the button text (just like a select box), which is a separate issue that I will raise (#1428 (closed)).