Add the 'common' role

* This role is used to install some basic packages (Vim, Git, tmux).
* It also sets up the default locale.
Add the 'rails-dev' role

* It sets up an environment to develop Ruby web-based applications.
Add a Vagrantfile that use Ansible to provision

* The only machine defined is called 'rails'.
* 'common' and 'rails-dev' roles are assigned to all machines.
Add a README with some basic instructions
Add the MIT 'License'
Add a .gitignore
Add a example host_vars file
First commit
Changes