Signed-off-by: Michal Hrusecky <Michal@Hrusecky.net>

Commiting basic building script. Some functionality is already there, what is
missing is handling branches and freezing stuff, correct version setup (no need
in development for now), userlist generation and medkit creation (no need till
we build at least a big part of packages).

Signed-off-by: Michal Hrusecky <Michal@Hrusecky.net>