Added files directory and will copy local files to server on deploy

Even though sunzi can already pull in files that are specified in sunzi.yml, I often have other static files that are specific to provisioning a specific box.  Those files make sense to only live in my project repo.  Think of nginx config and vhost files.

Rather than giving these an absolute path to my sunzi-based project, I'd prefer to just add them to the project in a 'files' directory.  I just need sunzi to then copy that directory over into the compiled directory as part of a deployment.

Let me know if you think this makes sense.