Add flash messages
Add new style rules and mixins
Iterate the sign-in form and showing the current user
Restrict access unless authenticated
Add test helpers to stub user sessions and view rendering
Set config.i18n.enforce_available_locales to true

This stops the deprecation notice from appearing each time I run the
tests.
Iterate the Eatery model

Add tests and a validation on the name field, and correct the logic to
find an Eatery by the friendly id.
Allow eateries to be created
Define a Recommendation model

A recommendation exists between a user and an eatery.