Fix some edge cases for the 'remember me' functionality and the user stores in the database.

Before you save, for the first time, the user in the database, you need
to do this:
    $user = App::make('User');
    //...
    $user->setRememberToken($ldapUser->getRememberToken());
    //...
    $user->save();

See also: https://github.com/ccovey/ldap-auth/issues/30