Fabric code for deploying the site to a vagrant box

These changes allow you to run a command to deploy the bugtracker site to a vagrant box. We can walk through the code.

Hopefully you could clone this branch, run `vagrant up` and then run `fab vagrant provision` and then `fab vagrant deploy:origin/fabric_example`. After that hopefully you'd be able to point your browser to 127.0.0.1:8080 to see your site.