Improve Wordpress directory support

First of all, i dont think it is ready to merge, let discuss the possibility. 

I added a new option at wordpress env configuration: `wp_own_directory`, `wp_lang`, `wp_debug`

`wp_lang` and `wp_debug` are self explanatory.

When `wp_own_directory` is set to `true` it will make a custom configuration at wp-config.php to allow access blog under root project folder. This eliminates the need of Virtual Host to wordpress folder and eliminate the public symlink. More information at: http://codex.wordpress.org/Giving_WordPress_Its_Own_Directory
It help me to configure project under subfolder.

So what you think? 

Ps.: Sorry for my grammar. :baby: