Added forgotten type.ex file

lib/grains/type.ex

+defmodule Grains.Type do
+
+  @nr_types 4
+
+  def select_type(uuid) do
+    {i, _} = Integer.parse(uuid, 16)
+    Integer.mod(i, @nr_types)
+  end
+
+end

mix.exs

@@ -3,7 +3,7 @@ defmodule Grains.Mixfile do
 
   def project do
     [app: :grains,
-     version: "0.0.63",
+     version: "0.0.64",
      elixir: "~> 1.2",
      elixirc_paths: elixirc_paths(Mix.env),
      compilers: [:phoenix, :gettext] ++ Mix.compilers,