elixir-lang/elixir-lang.github.com — pull request #283 by ernie (2014-06-24 13:43:26+00:00)
Title: Various touchups to Mix and OTP Chapter 3.

As before, minor tweaks to chapter 3. I expanded a bit on why tuples are used in `handle_call/3` and `handle_cast/2`. It might be too obvious/elementary for some, but hopefully helpful to others. :)