Add support for http://memedad.com/ expandos

Hello,

I've started noticing a few links from memdad on here and there on reddit and given the sites domain page ( http://www.reddit.com/domain/memedad.com/ ) shows a reasonable amount of activity, I thought i may as well have a quick look at how hard it would be to add expando support for it.

As it turns out it was actually a really simple one, so here it is :)