added some class:
- utils (contain utils and contains __autoload, must be required_once in each class)
- db.class (a class to connect and query on database)
- category.class (a class to manage category)
- config.class (contain static configurazion (db and others stuff)
- jquery-2.1.1.js (jquery lib, used for test)
- provaajax and provalistcategory are a demo to test ajax