Some suggestions #16
Description
Great job, just some suggestions.
For consistency I think it would be good to take a look at the ZF2 interfaces for Acl. Like for example the AclInterface. The ZF2 isAllowed method from the interface has the arguments in the following order: role, resource, privilege. I think it would be a small effort to stick to these defaults by implementing the interfaces as provided in Zend\Permissions\Acl.
It would be worth considering to support role inheritance by self referencing to the parent role like in bjyoungblood his BjyAuthorize : https://github.com/bjyoungblood/BjyAuthorize/blob/master/src/BjyAuthorize/Acl/Role.php
https://github.com/bjyoungblood/BjyAuthorize/blob/master/src/BjyAuthorize/Provider/Role/ObjectRepositoryProvider.php
There are also role interfaces available in Zend\Permissions\Acl.