Suggest libraries for Bonjour support, don't depend on them

Ignore-this: 69feba62f1794be5c5dffb47f4c008b5

darcs-hash:20120904161728-56b4d-ba54655b98dffd5b3e2f36a75a454e995b9fe4dd
Fixed Python version dependency

Ignore-this: 10d6cf748806159de238303853c028a3

darcs-hash:20120904161927-56b4d-6d3113b7510f2f640f8999017638a35e8fcd98fe