Bugfix: link for debian-wheezy.box in .kitchen.yml is down, added https://dl.dropboxusercontent.com/s/cd583cuf0mbcix7/debian-wheezy-64-chef.box

Signed-off-by: Patrick Meier <patrick.meier111@googlemail.com>
Bugfix: Link to rhel5-guide-i731.pdf was brocken

Signed-off-by: Patrick Meier <patrick.meier111@googlemail.com>
Merge pull request #3 from atomic111/master

Bugfix: broken link for debian wheezy vagrant box in .kitchen.yml and also broken link for NSA RedHat security guide in README.md