Moose::Meta::Role::create should honor "roles"

Moose::Meta::Role::create should honor "roles"

Moose::Meta::Role's docs claim create() is "identical" to the create() in
Moose::Meta::Class, yet it currently does not honor "roles" if passed to it.

This commit fixes that by having  Moose::Meta::Role::create() honor a roles
named parameter, and adds tests to validate/ensure that behaviour.