for get CCPoint

I think it resolves DRY

it is troublesome
    CCDictionary *spawnPoint = objectGroup->objectNamed("SpawnPoint");
    int x = ((CCString)*spawnPoint->valueForKey("x")).intValue();
    int y = ((CCString)*spawnPoint->valueForKey("y")).intValue();
    _player->setPosition(ccp(x,y));