Fix .navbar-right > .dropdown-menu alignment

Before:
![screen shot 2013-08-13 at 10 13 10 pm](https://f.cloud.github.com/assets/1933700/959484/84e5c878-0489-11e3-8c99-e7f1f94ded56.png)

After:
![screen shot 2013-08-13 at 10 14 36 pm](https://f.cloud.github.com/assets/1933700/959485/86a3f928-0489-11e3-95aa-3f4116aab245.png)