'relationships' hard coded into loop when resources are built

In _services_process_resource(), is the following loop

  // Actions and relationships.
  foreach (array('relationships', 'actions', 'targeted_actions') as $class) {
    if (!isset($resource[$class])) {
      continue;
    }

    foreach (array_keys($resource[$class]) as $action_name) {
      $class_singular = trim($class, 's');
      $controllers[$name . '/' . $class_singular . '/' . $action_name] = &$resource['relationships'][$action_name];
    }
  }

This causes all sorts of chaos because it hard codes a check for relationships, even when processing actions and targeted actions. Attached patch fixes this.