Code review comment for lp:~superm1/usb-creator/grub-support

After more testing i've merged this in today.

The boot.img was used as it existed on the system.
The handcrafted core.img was generated like this:

#grub-mkimage -c grub.cfg -o core.img biosdisk part_msdos fat search_fs_file iso9660

grub.cfg:
     search.file /boot/grub/i386-pc/grub.cfg root
     set prefix=($root)/boot/grub/i386-pc