Vagrant for the project

**It's missing the box url. I'm uploading it to Dropbox.**

The box contains:

- PostgreSQL
- Ruby 1.9.2-p320 with Rbenv
- Imagemagick

The instructions to use it: https://github.com/meurio/meurio/wiki/Vagrant

Rspec tests are passing but the Cucumber features are not. The Facebook login
seems to be failing (the Omniauth callback returns error 500).