initial work on #32, to support flat disk images (no partitions)
small tweaks/cleanups, only funcitonal difference is setting root devicename to sda1 for device mappings for pvm/ebs (seems right, may have to unwind)
get the rootfs label right, dont "fix" grub on flat images
attempt to use extlinux to get though the hvm boot issue on flat image
achievement: ultimate bootfix? first hvm, no partition boot, via extlinux (was missing a step). block device mappings may need adjustment, root mounts as /dev/xvda, where we expect /dev/xvda1
default back to partition mode
revert a change made on ebs pvm tagging for root volume
add notes
Merge branch 'feature/flat_disks' into develop
concept for device node selector, for #42