Create ykcrypto.sh

This is a helper script to be referenced in your crypttab config.
Tested in Ubuntu 12.10
Create cryptopenyk

This is an initramfs-tool hook to add ykchallresp support (probably a duplicate to the other branch version)
Update README
Update README
Updated README for user-derived challenge code
initramfs hook to add ykchalresp
Helper Script for crypttab to get key from YK
Removed other branch files

The remaining files are all that is neccessary to get this working.
Merge pull request #1 from kfiducia/user-provided-challenge

User provided challenge