use human-readable command line flags
don’t mount guest additions ISO directly to /mnt
roll lock-root.sh up into vagrant.sh

I couldn’t think of a reason why they should continue to be separate
scripts.
rename zero-disk.sh to cleanup.sh

I want to broaden the scope of this script beyond just disk zeroing
stuff.
update templates to reflect script name changes
add Fedora 20 template

In addition to updating all of the necessady Fedora 20 bits, the disk
interface has been updated from IDE to SATA and the network adapter
type has been changed to virtio.  Also, a few minor things have been
simplified.