add some lines of header
check are we run as root
raring is not animal but codename - second part of Ubuntu release name is animal
we need numeric version also for development release
convert 13.04 to 1304 to make checks easier
make use of easier check
save emmc for longer - write in 4MB blocks
since 13.04 we have vboot-utils, kernel, x11 driver in repository
use Ubuntu kernel for 13.04+