Just an FYI, there is a new version of the book coming out in a few months which details the changes in Phoenix 1.3 [1]. Also, there is another book which explains how to build an app with Elixir only and then Elixir+Phoenix [2]. However, I haven't actually read it yet as I'm waiting for it to be officially released.

[1] https://pragprog.com/book/phoenix13/programming-phoenix-1-3

[2] https://pragprog.com/book/lhelph/functional-web-development-...