KeyError  if there's no ~/httproxy/config

When  ~/httproxy/config is not present a KeyError 'main' is raised. This happens in `handle_config`:iniconf=dict(inifile['main']). Numerous ways to solve this of course, I've just added a check to see if 'main' is a section in inifile, and if not - add the section.

regards

/rune