Extract Bamboo.Phoenix (beam-community#581)

What changed?
=============

We extract `Bamboo.Phoenix` to a standalone library.

That makes it easier for those who want to use Bamboo but don't want to
depend on Phoenix. Prior to this commit, the Phoenix dependency was
optional. But now, those who want to use `Phoenix`'s rendering engine
can use [`bamboo_phoenix`].

[`bamboo_phoenix`]: https://github.com/thoughtbot/bamboo_phoenix

README.md

@@ -261,8 +261,11 @@ examples.
 
 ## Using Phoenix Views and Layouts
 
-Phoenix is not required to use Bamboo. However, if you do use Phoenix, you can
-use Phoenix views and layouts with Bamboo. See [`Bamboo.Phoenix`].
+Phoenix is not required to use Bamboo. But if you want to use Phoenix's views
+and layouts to render emails, see [`bamboo_phoenix`] and [`Bambooo.Phoenix`].
+
+[`bamboo_phoenix`]: https://github.com/thoughtbot/bamboo_phoenix
+[`Bambooo.Phoenix`]: https://hexdocs.pm/bamboo_phoenix/Bamboo.Phoenix.html
 
 ## Viewing Sent Emails
 

mix.exs

@@ -10,7 +10,6 @@ defmodule Bamboo.Mixfile do
       elixir: "~> 1.6",
       source_url: @project_url,
       homepage_url: @project_url,
-      compilers: compilers(Mix.env()),
       test_coverage: [tool: ExCoveralls],
       preferred_cli_env: [coveralls: :test, "coveralls.circle": :test],
       elixirc_paths: elixirc_paths(Mix.env()),
@@ -26,9 +25,6 @@ defmodule Bamboo.Mixfile do
     ]
   end
 
-  defp compilers(:test), do: [:phoenix] ++ Mix.compilers()
-  defp compilers(_), do: Mix.compilers()
-
   # Configuration for the OTP application
   #
   # Type "mix help compile.app" for more information
@@ -57,8 +53,6 @@ defmodule Bamboo.Mixfile do
       {:mime, "~> 1.4"},
       {:ex_machina, "~> 2.4", only: :test},
       {:cowboy, "~> 1.0", only: [:test, :dev]},
-      {:phoenix, "~> 1.1", optional: true},
-      {:phoenix_html, "~> 2.2", only: :test},
       {:excoveralls, "~> 0.13", only: :test},
       {:floki, "~> 0.29", only: :test},
       {:ex_doc, "~> 0.23", only: :dev},

mix.lock

@@ -20,8 +20,6 @@
   "mochiweb": {:hex, :mochiweb, "2.15.0", "e1daac474df07651e5d17cc1e642c4069c7850dc4508d3db7263a0651330aacc", [:rebar3], [], "hexpm", "b960d1cbcf40a30963eeee90ab7aeae074cbfa9a238561fb4434add1afc3075c"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.1.0", "3a6fca1550363552e54c216debb6a9e95bd8d32348938e13de5eda962c0d7f89", [:mix], [], "hexpm", "08eb32d66b706e913ff748f11694b17981c0b04a33ef470e33e11b3d3ac8f54b"},
   "parse_trans": {:hex, :parse_trans, "3.3.0", "09765507a3c7590a784615cfd421d101aec25098d50b89d7aa1d66646bc571c1", [:rebar3], [], "hexpm", "17ef63abde837ad30680ea7f857dd9e7ced9476cdd7b0394432af4bfc241b960"},
-  "phoenix": {:hex, :phoenix, "1.3.3", "bafb5fa408d202e8d9f739e781bdb908446a2c1c1e00797c1158918ed55566a4", [:mix], [{:cowboy, "~> 1.0", [hex: :cowboy, repo: "hexpm", optional: true]}, {:phoenix_pubsub, "~> 1.0", [hex: :phoenix_pubsub, repo: "hexpm", optional: false]}, {:plug, "~> 1.3.3 or ~> 1.4", [hex: :plug, repo: "hexpm", optional: false]}, {:poison, "~> 2.2 or ~> 3.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm", "8bde28268d88de0c3141da0945ee2da93bd33473f94e19305dcf174a8dd42bac"},
-  "phoenix_html": {:hex, :phoenix_html, "2.11.2", "86ebd768258ba60a27f5578bec83095bdb93485d646fc4111db8844c316602d6", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "2fe8543036a9cb2103efe26c18874512dc0e005afba60dbfe90aa56e27c198a2"},
   "phoenix_pubsub": {:hex, :phoenix_pubsub, "1.0.2", "bfa7fd52788b5eaa09cb51ff9fcad1d9edfeb68251add458523f839392f034c1", [:mix], [], "hexpm", "6f9193364c5de86b85e8d3a80294a134aecf6c5618adcbae668608749e00a7f7"},
   "plug": {:hex, :plug, "1.6.0", "90d338a44c8cd762c32d3ea324f6728445c6145b51895403854b77f1536f1617", [:mix], [{:cowboy, "~> 1.0.1 or ~> 1.1 or ~> 2.4", [hex: :cowboy, repo: "hexpm", optional: true]}, {:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}], "hexpm", "b6761cce9b0e369eb3d19da7f8805c1a55e0a7fdc2f65e2fc3802e9305481dea"},
   "poison": {:hex, :poison, "3.1.0", "d9eb636610e096f86f25d9a46f35a9facac35609a7591b3be3326e99a0484665", [:mix], [], "hexpm", "fec8660eb7733ee4117b85f55799fd3833eb769a6df71ccf8903e8dc5447cfce"},