when invitations have been loaded. Possible status codes include:
 <ul>
 <li><code><a href="/reference/com/google/android/gms/games/GamesClient.html#STATUS_OK">STATUS_OK</a></code> if data was successfully loaded and is up-to-date.</li>
 <li><code><a href="/reference/com/google/android/gms/games/GamesClient.html#STATUS_NETWORK_ERROR_STALE_DATA">STATUS_NETWORK_ERROR_STALE_DATA</a></code> if the device was unable to retrieve
 the latest data from the network.</li>
 <li><code><a href="/reference/com/google/and