Moved some code to libraries.
Added cleaning Yum cache after installing chroot.
Added a processing command line options.

This is a skeleton for how yumbootstrap should behave.
Added implementation of the operations (install and so on).
Renamed the run script to the final name and added some installer code.
Added progress messages.
Fixed some typos that caused exceptions.
Added TODO list.
Pushed processing yum.conf around.
Allowed optional arguments in command line.
Added printing yum.conf.
Updated TODO list.
Added support for --exclude option.
Moved read() on child process to sh.run().
Added dying on child command running errors.
Running commands made more robust.

os.system() and os.popen() replaced with subprocess module. Even chrooting
could be carried without resorting to /usr/sbin/chroot.
Added TODO and example configuration.
Changed one option name.
Added initial version of config loader.
Added reading package list.