Update fullcalendar.css

Updated to 1.6.4
Update fullcalendar.js

Updated to 1.6.4
Update fullcalendar.min.js

Updated to 1.6.4
Update fullcalendar.print.css

Updated to 1.6.4
Update gcal.js

Updated to 1.6.4
Create it.php
Merge pull request #12 from realtebo/master

Updated assets dir to full Calendar 1.6.4 and added italian locale file