Ajaxify the core

- Removed MSG in URI, made it through AJAX requests
- Added new func.messages,php file which handles messages via AJAX
- added ajax.js file which actually handles AJAX requests
- Redirection function added for AJAX redirections

After this ne commit all errors or messages will be thrown into chosen
<div>, and also they can be sorted and colored proper way (green success
messages, red error messages and so on). No more URI ?msg string.

Also added text description for module file for later parsing for
viewing it in admin panel.