Tag created as a reference between the PHP-GTK 2.0.1 and PHP-GTK 3.0.…

… A empty and independent branch to proceed with the documentation, website e source code for PHP-GTK3 will be created. The development of PHP-GTK2 ends here. Now we have focus on the development of PHP-GTK3. The branch where the PHP-GTK3 will be developed is: dev-php-gtk3