Added MD5 checks for all 3 versions of KFHD8.9 OS offered.

Fixed incorrect version numbering of KFHD8.9 OS's.
[TODO] Add Doublecheck of MD5 AFTER download, currently used to check existing file
[TODO] Add back bootloader menu access once code overhauled for reliability

Signed-off-by: David Long <david.long@canonicaldev.com>