linux kernel for ARM emulator

This doodle is (heavily) based on information found here:
http://balau82.wordpress.com/2010/03/22/compiling-linux-kernel-for-qemu-arm-emulator/

It provides simple instructions for compiling a simple kernel for the qemu
system emulator (ARM) and generates a "hello world" initrd which is run after
the kernel is done booting.