added ability to spec additional script to be inserted in the stage 2
chroot from the command line via -S parameter

removed swap file creation from the build. script will remain on image
and can be called later if needed via /sbin/ec2-make-swap >>
/var/log/ec2-make-swap.log

added custom exit/warnmsg functions to clean up code (not as many echo "
" >&2 )

added colors to output via tput