Added sipsimple.bonjour module from pybonjour

Ignore-this: cc1775594e8e180311d7a50c535d8c4a

darcs-hash:20100402131544-1e3d8-0fdf946a1c5980cea273a977b9335b51bfc8f9f1
Added publishing and discovery support to BonjourAccount

Ignore-this: 6d5d7bbc891fcda908845180a5caeb91

darcs-hash:20100402150517-1e3d8-51f3da105ab8bafa1e0d3437dc40b3db099e66bf