Scope sqlite under dev and test
Add book addition feature and persistence
Rename feature specs
Add user sign in feature

Powered by devise
Book rating on addition
Add sign up feature
Add book rating examples for existing books
Fix a bug: save user id with the new book rating
Show ratings by other users

Also remove average rating (not mentioned in the requirements)
Make the books index look nicer
Add pagination via kaminari
Authorization examples
Define rating authorization rules
Add admin changing user ratings feature
Fix a bug for guest users
Add database seeds