Update README.md; add VirtualBox as a dependency
roles/lemp: Add php5-intl to apt-get list

Add php5-intl to the list of packages to be installed as it is
required in the fix Tatoeba/tatoeba2@f3d647f45088443eb27f1e42c5eaf18322283b1e

roles/lemp: Add php5-intl to apt-get list

Add php5-intl to the list of packages to be installed as it is required in the fix f3d647f45088443eb27f1e42c5eaf18322283b1e