AddressBok and ios5 issue

[jonasman]

I would replace the actual method implementation of + (ABAddressBookRef) addressBook;

to:

• (ABAddressBookRef) addressBook
  {
  if (shared) return shared;

  CFErrorRef errorRef;

  if (&ABAddressBookCreateWithOptions != NULL){
  shared = ABAddressBookCreateWithOptions(NULL, &errorRef);
  }
  else
  {
  shared = ABAddressBookCreate();
  }

  if (!shared)
  {
  NSError *error = (__bridge_transfer NSError *)errorRef;
  NSLog(@"Error creating new address book object: %@", error.localizedFailureReason);
  return nil;
  }

  //ABAddressBookRegisterExternalChangeCallback(shared, addressBookUpdated, NULL);
  return shared;
  }