Added another option to UserRepository so Password Grant can ask model to verify password.
Added another option to UserRepository so Password Grant can ask model to verify password.

emiliopedrollo/passport,emiliopedrollo/passport,mashy-industries/passport,refactory-id/passport-student,nueko/passport,refactory-id/passport-student,justty/passport,mashy-industries/passport,justty/passport,laravel/passport,nueko/passport