Add github links to generated docs

mix.exs

@@ -7,6 +7,8 @@ defmodule Cipher.Mixfile do
      elixir: ">= 1.3.0",
      package: package(),
      description: "Elixir crypto library to encrypt/decrypt arbitrary binaries.",
+     source_url: "https://github.com/rubencaro/cipher",
+     docs: [source_ref: get_commit()],
      deps: deps()]
   end
 
@@ -19,8 +21,12 @@ defmodule Cipher.Mixfile do
 
   defp deps do
     [{:poison, "~> 2.0 or ~> 3.0"},
-     {:ex_doc, ">= 0.0.0", only: :dev},
+     {:ex_doc, "~> 0.14", only: :dev, runtime: false},
      {:plug, ">= 1.1.0"}]
   end
 
+  defp get_commit do
+    :os.cmd('git rev-parse --short HEAD') |> to_string |> String.trim_trailing("\n")
+  end
+
 end

mix.lock

@@ -1,5 +1,5 @@
-%{"earmark": {:hex, :earmark, "1.0.1", "2c2cd903bfdc3de3f189bd9a8d4569a075b88a8981ded9a0d95672f6e2b63141", [:mix], []},
-  "ex_doc": {:hex, :ex_doc, "0.13.0", "aa2f8fe4c6136a2f7cfc0a7e06805f82530e91df00e2bff4b4362002b43ada65", [:mix], [{:earmark, "~> 1.0", [hex: :earmark, optional: false]}]},
+%{"earmark": {:hex, :earmark, "1.2.3", "206eb2e2ac1a794aa5256f3982de7a76bf4579ff91cb28d0e17ea2c9491e46a4", [:mix], [], "hexpm"},
+  "ex_doc": {:hex, :ex_doc, "0.16.2", "3b3e210ebcd85a7c76b4e73f85c5640c011d2a0b2f06dcdf5acdb2ae904e5084", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}], "hexpm"},
   "mime": {:hex, :mime, "1.0.0", "b63027733bba00b1013bad14e25dc8b6629ecb817731544a88a0fd14f2a55685", [:mix], []},
   "plug": {:hex, :plug, "1.1.6", "8927e4028433fcb859e000b9389ee9c37c80eb28378eeeea31b0273350bf668b", [:mix], [{:cowboy, "~> 1.0", [hex: :cowboy, optional: true]}]},
   "poison": {:hex, :poison, "2.1.0", "f583218ced822675e484648fa26c933d621373f01c6c76bd00005d7bd4b82e27", [:mix], []}}