Role name are always required

As I'm strictly comparing roles names at [Rbac.js#L48](https://github.com/CentaurWarchief/RbacJS/blob/develop/src/Rbac.js#L48), I should ensure that `Role` always will have a name for make it work flawlessly; also I'd have say that a more beautiful solution is to compre both `Role` objects itself, lol.

:+1: