Switch to pybuild in debhelper, remove need to delete setup.cfg
Autobuild incremented .deb version when version is incremented
Maintain debian native scripts in deb/ instead of debian/

It has been suggested that in order to upload pagekite to Debian
it would be easy if the non-native packages be built by Debian team
while native package building stays separate in upstream. To
maintain non-native package changes easily, keeping upstream debian
scripts in deb/ directory would greately help.