A little mix.exs reorganization and cleanup.

mix.exs

@@ -1,48 +1,54 @@
 defmodule Thrift.Mixfile do
   use Mix.Project
 
+  @version "1.0.0"
+  @project_url "https://github.com/pinterest/elixir-thrift"
+
   def project do
     [app: :thrift,
-     version: "1.0.0",
-     description: "Thrift utilities for Elixir",
+     version: @version,
      elixir: "~> 1.0",
-     description: description,
-     source_url: project_url,
-     homepage_url: project_url,
-     package: package,
      deps: deps,
+
+     # Build Environment
      erlc_paths: ["ext/thrift/lib/erl/src"],
      erlc_include_path: "ext/thrift/lib/erl/include",
      compilers: [:erlang, :elixir, :app],
+
+     # Testing
      test_coverage: [tool: ExCoveralls],
      preferred_cli_env: ["coveralls": :test, "coveralls.detail": :test, "coveralls.post": :test],
+
+     # URLs
+     source_url: @project_url,
+     homepage_url: @project_url,
+
+     # Hex
+     description: description,
+     package: package,
      ]
   end
 
   def application do
      []
   end
 
-  defp description do
-     """
-     elixir-thrift contains a set of useful utilities to work with Thrift in Elixir. Erlang Thrift runtime library is embedded.
-     """
+  defp deps do
+     [{:excoveralls, github: "parroty/excoveralls", tag: "v0.4.3", override: true, only: :test}]
   end
 
-  defp project_url do
-    """
-     https://github.com/pinterest/elixir-thrift
+  defp description do
      """
-  end
+     A collection of utilities for working with Thrift in Elixir.
 
-  defp deps do
-     [{:excoveralls, github: "parroty/excoveralls", tag: "v0.4.3", override: true, only: :test}]
+     Provides a copy of the Erlang Thrift runtime.
+     """
   end
 
   defp package do
-     [files: ["ext", "lib", "mix.exs", "README.md", "LICENSE"],
-      maintainers: ["Jon Parise", "Steve Cohen"],
+     [maintainers: ["Jon Parise", "Steve Cohen"],
       licenses: ["Apache 2.0"],
-      links: %{"GitHub" => project_url}]
+      links: %{"GitHub" => @project_url},
+      files: ["ext", "lib", "mix.exs", "README.md", "LICENSE"]]
   end
 end