.dropdown-toggle::after causes offset alignment in a container when used with .pull-*-right

Created by: kybishop

As of alpha2, .dropdown-toggle::after contains margin-right: .25rem, which causes offset alignment if the dropdown is the last element of a container where .pull-*right is used on the dropdown.

Example within a navbar: https://jsfiddle.net/6twft72d/ https://jsfiddle.net/6twft72d/12/

This is admittedly a bit nitpicky, but it looks the slightest bit off when compared to how it used to look in alpha 1.