Fix a problem with OTP release generation

Store erl_parse_erlc.beam and erl_parse_shell.beam in priv rather than ebin.
This way, those modules will not be included in .script file during release
generation. Otherwise, when these files are listed in .script file, Erlang
attempts to load them which causes system start to fail.

priv/.gitignore

@@ -0,0 +1,2 @@
+erl_parse_erlc.beam
+erl_parse_shell.beam

rebar.config

@@ -15,8 +15,10 @@
 
 
 {post_hooks, [
-    {compile, "cp erlson_erlc/ebin/erl_parse.beam ebin/erl_parse_erlc.beam"},
-    {compile, "cp erlson_shell/ebin/erl_parse.beam ebin/erl_parse_shell.beam"}
+    {compile, "cp erlson_erlc/ebin/erl_parse.beam priv/erl_parse_erlc.beam"},
+    {compile, "cp erlson_shell/ebin/erl_parse.beam priv/erl_parse_shell.beam"},
+
+    {clean, "rm -f priv/erl_parse_erlc.beam priv/erl_parse_shell.beam"}
 ]}.
 
 

src/erlson.erl

@@ -326,6 +326,7 @@ init(Mod) ->
     code:purge(erl_parse),
     code:delete(erl_parse),
 
+    code:add_path(code:lib_dir(erlson, priv)),
     case code:get_object_code(Mod) of
         {_, Code, File} ->
             code:unstick_dir(filename:dirname(File)),