Changes

Pkg-cacher is a transparent caching proxy daemon optimized for Debian and RPM packages. In other terms, pkg-cacher is a service that runs on a machine that other machines and containers, or "clients", use to update themselves instead of each of them directly hitting the package repositories. Pkg-cacher only downloads a file once and then gives that to all its clients, instead of each of the clients downloading the file from the Internet at large. It is based on [http://www.nick-andrew.net/projects/apt-cacher/ apt-cacher], available with Debian. This version has been modified to understand RedHat RPM repositories. It also adds support for the HTTP Range header and deals correctly with files which have the same name but different content on different distributions or in some cases different versions of the same distribution. Robert has setup repositories for Fedora, Centos and Debian.