First pass at an `~/.iex.exs` for Elixir
First pass at an `~/.iex.exs` for Elixir

Written about a month into using Elixir "in anger", so it's pretty
basic.

benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles,benizi/dotfiles