Accept configuration file with .yaml extension (#290)

ejabberdctl.cfg.example

@@ -152,7 +152,7 @@
 #' EJABBERD_CONFIG_PATH: ejabberd configuration file
 #
 # Specify the full path to the ejabberd configuration file. If the file name has
-# a ".yml" extension, it is parsed as a YAML file; otherwise, Erlang syntax is
+# yml or yaml extension, it is parsed as a YAML file; otherwise, Erlang syntax is
 # expected.
 #
 # Default: $ETC_DIR/ejabberd.yml

src/ejabberd_config.erl

@@ -185,7 +185,7 @@ get_plain_terms_file(File1, Opts) ->
 
 consult(File) ->
     case filename:extension(File) of
-        ".yml" ->
+        Ex when (Ex == ".yml") or (Ex == ".yaml") ->
             case p1_yaml:decode_from_file(File, [plain_as_atom]) of
                 {ok, []} ->
                     {ok, []};