OpenVZ Template work

This is a first attempt to add OpenVZ image creating

Also moved the README to markdown, so that it is correctly formatted

I prefer the script method, as that works better, and the image is quicker to build

let me know your thoughts
We'd prefer to be as 'non-root' as possible. We do this for openstack and for docker as well. 

One alternative would be to use cloud-init to handle root access via ssh key or similar. I'll admit I don't know openvz well enough to know if that's a possibility.  Thoughts?