Typo

Jabber notification didn't work for me, so I fixed it. Here's the patch. It's against 4.0.3. I had absolutely no luck in getting jabber4r to work, so I used xmpp4r instead. I also added the url to the comment notification, which makes it handy for replying/moderating comments. I don't know if the content_state just presumed ham is the "right" place, but it's working for me.