autoload.php is not loaded in development config directory [solved]

[eluser]Zaher Ghaibeh[/eluser]
hi:
am using the new version 2.0.1
i have created a 'development' directory under the 'config' directory, i have included the following files :
1- config.php
2- database.php
3- autoload.php

the first two files loaded as normal but the third file (autoload) is not loaded at all ..

i have searched the user_guide but i didn't find which files can be loaded from subdirectory and which not ..
so is this a bug ?
or am doing something wrong ?
-------------------
for all of you check this link : http://alakkad.me/blog/codeigniter-environment/
and my second comment ..

thanks