Rename headers directory

Author: jonatanklosko

include/fine.hpp renamed to c_include/fine.hpp

@@ -8,7 +8,10 @@ defmodule Fine do
 
   @moduledoc readme_docs
 
-  @include_dir Path.expand("include")
+  # Note that include/ is a conventional location for Erlang header
+  # files (.hrl) and it is copied to _build/. For this reason, we
+  # pick a different name.
+  @include_dir Path.expand("c_include")
 
   @doc """
   Returns the directory with Fine header files.

include/fine/sync.hpp renamed to c_include/fine/sync.hpp

@@ -47,7 +47,7 @@ defmodule Fine.MixProject do
     [
       licenses: ["Apache-2.0"],
       links: %{"GitHub" => @github_url},
-      files: ~w(include lib mix.exs README.md LICENSE CHANGELOG.md)
+      files: ~w(c_include lib mix.exs README.md LICENSE CHANGELOG.md)
     ]
   end
 end