Setup instructions

Ready for review, @anselmbradford. This fixes #303.

Note that there a few changes you will need to make to your local environment after merging these changes:

1) Replace "TRANSLATE_URL" in your `application.yml` with "DOMAIN_NAME" and set it to `lvh.me`
2) From now on, visit the site locally via http://lvh.me:8080 (or whatever port you're using). Translation won't work with `localhost`.