Switch over to Elixir option parsing.

test/options_test.exs

@@ -1,8 +0,0 @@
-defmodule OptionTest do
-  use ExUnit.Case, async: true
-
-  test "can target specifc koans" do
-    Options.start(["--koan=Strings"])
-    assert Options.initial_koan() == Strings
-  end
-end