memo: boot option

This is my memo to pass boot option to anaconda.
There is two ways to enter boot option.
1. add repo=<host>/Linux/fedora/releases/13/Fedora/x86_64/os/images/
This option get install.img from the URL.

2. add askmethod
This option ask you to where to get install.img from(e.g. http, nfs and so on).