library/roles/oracle-jdk/tasks/main.yml: now it installs on debian too.
library/roles/php-fpm: Support saving sessions on memcache. Needs memcache (there's a role for it).
library/roles/postfix-relay: Now it can be configured to permit unencrypted connections from the local clients.
library/roles/users: Fix the sudo stuff.
library/roles/mysql: role that installs a mysql db, secure the configuration and manage the databases.
library/roles/php-fpm: installs php-fpm and configures all the workers.
d4science-gcube: playbook to install and configure a mediawiki system.