can't handle some forums links

```
i think you should do something for

http://xenforo.com/ (xenForo Forums)

http://www.simplemachines.org/ (SMF Boards)

http://www.invisionpower.com/ (Invision Boards)

:(
```

Original issue reported on code.google.com by `persianp...@gmail.com` on 22 Jan 2012 at 5:32
