Add mkiso script

mkiso converts an image into ISO/Joliet compatible format suitable for
burning onto a CD/DVD and having it cross-compatible with Win/OSX/*NIX
Create README.md
Add comment identifying source for mkiso
Add backup script to copy folder contents

Folder contents can be either tarred and gzipped or saved to a git
repository. The default configuration is to use git and tags every time
the backup is made, even if there were no commits.
Import scripts from dotfiles repository
Update README to reflect new scripts