Added __toString() methods to classes View and Template
Added HttpFoundation Component (Symfony)
Corrrected some small bugs
Moved $SITE/includes/global.php to $SITE/setup.php
Mount modules with System class methods in site setup
Improved the DatabaseRecord classes

* Some functional improvements
* Documentation improvements
* Restructuring

Affected classes:
* DatabaseRecord
* Localization
* User
* UserGroup
Added new Session manager
Added UserGroup::isAuthorized() replacing AccessManager class
Improved and fixed the Database classes
Reworked templates system
Added Twig template engine