Initial full working revision

Signed-off-by: Celelibi <celelibi@gmail.com>
Fix wong open mode for output file

Just a "<" instead of ">".

Signed-off-by: Celelibi <celelibi@gmail.com>
unautokey: New tool for breaking autokey cipher

This tool is a quick and dirty proof of concept that Autokey cipher can
be broken without knowing any plain text word using basically the same
technique than for breaking Vigenere.

Signed-off-by: Celelibi <celelibi@gmail.com>