separated the resource by category, teoria esercizi laboratorio
implementing the registration of a new user! 

changed some wrong names! name class <> namefile
Merge branch 'master' of https://github.com/davcri/Unibox.git

Conflicts:
	Smarty_dir/templates/navigation_contentSubject.tpl
	index.php
implemented the registration of a new user
Merge branch 'master' of https://github.com/davcri/Unibox.git
added the tpl files registration_completed and registration_form