Adding updated Vagrantfile

Updated Vagrantfile to workaround migration dependency outlined in https://github.com/opendoor/django-gather/issues/2
**Instructions**
Ensure that any other local django process is no longer running
Install vagrant: https://www.vagrantup.com/downloads
Install VirtualBox: https://www.virtualbox.org/wiki/Downloads
checkout this pull request

```
cd modernomad
vagrant up
```

Then visit http://localhost:8989