Missing parameter on Vagrantfile

See
https://github.com/berkshelf/berkshelf/pull/1330#issuecomment-66813498
Use chef.io domain instead!

See https://github.com/berkshelf/berkshelf/pull/1350
Create deployer user
Execute apt-get update
Install ruby using rbenv
Install nginx for unicorn and setup folders

Setup folders for Capistrano
Install and setup PostgreSQL