MMMmmmm... I was looking exactly for the same. I have 2 testing servers and It happens that in one I have the "Twenty Thirteen" theme and in the other one the "sommerce" theme. With the first one it works ok but I don't know how to arrange for the sommerce theme. You can have a look here:
http://5.135.158.142/wordpress/
http://www.musicalis.es/wordpress_test/
Can you give me an idea?