encryption class with tests follows now PSR-2 standard

Signed-off-by: Sebastian Brosch <sebastian.brosch@brosch-software.de>
registry class with tests follows now PSR-2 standard

Signed-off-by: Sebastian Brosch <sebastian.brosch@brosch-software.de>
new user and group classes with tests (follows PSR-2 standard)

Signed-off-by: Sebastian Brosch <sebastian.brosch@brosch-software.de>
updated phpunit configuration for the new tests.

Signed-off-by: Sebastian Brosch <sebastian.brosch@brosch-software.de>