Bump Rails
Remove rails_12_factor gem for Ninefold
Slightly improve books#show view
Automatically deploy successful builds to ninefold
Update guardfile to use bundle exec
Update pages#show test to reflect breaking change in Rails

https://github.com/rails/rails/issues/16058
Rails says we no longer need db:test:prepare.
Update Blitz.io authorization to test Ninefold
Update new relic