Two fixes

[hughescr]

I fixed two things:

1. Hostname resolution seems to have been broken -- in the sample Browser.py the call self.r.getServiceInfo(type, name) would always return None, basically because the hostname wasn't being looked up correctly so the thing was always timing out and not filling in service info. I think I fixed this with 7674853b but please check my math on that... It works for me now, but I might be doing something dumb
2. DNSAddress's repr function was ugly. I made it more prettier.