Use Vagrant to initalize and provision a consistent development environment

Instead of having to worry about which versions of `npm`, `compass`, `sass`, and the various Python and Node.js requirements, we can just use Vagrant to provide a consistent environment for development and (possibly) in production.

The *Getting Started* section in the [README.md updates](https://github.com/marquee/runtime/blob/4422dbaffbd5ec29adb5ab437759c26c5df28ac9/README.md) of this pull request provide instructions on how to work on the runtime under Vagrant, but basically require you to do the following:

1. Uninstall binrary release of Vagrant and build from source
2. Install Ansible from source with Homebrew
3. Add the following to your `~/.ssh/config`;
```
    Host 10.10.10.2
      StrictHostKeyChecking no
      UserKnownHostsFile /dev/null
```

4. `vagrant up`
5. `vagrant ssh`

When you ssh into the box, the `.profile` file that's copied over will activate the runtime virtualenv and put you in the right directory (`/home/vagrant/runtime`).

Until we move to a non-Flask specific command line interface (merging the [feature/docopts branch](https://github.com/marquee/runtime/pull/11) would be a good start), you'll need to manually set the host when running the debug server by issuing the following command: 
```
(runtime)[/home/vagrant/runtime]$ python manage.py runserver -t 10.10.10.2
```