message: Adapt queue contract to new Storage Results
diff: @@ -93,7 +93,7 @@ fn enqueue<S: Storage, A: Api, Q: Querier>(
  };
  let data = to_vec(&Item { value })?;
  - deps.storage.set(&[my_key], &data);
  + deps.storage.set(&[my_key], &data)?;
  Ok(HandleResponse::default())
  }
  @@ -107,7 +107,7 @@ fn dequeue<S: Storage, A: Api, Q: Querier>(
  let mut res = HandleResponse::default();
  if let Some((k, v)) = first {
  // remove from storage and return old value
  - deps.storage.remove(&k);
  + deps.storage.remove(&k)?;
  res.data = Some(Binary(v));
  Ok(res)
  } else {
  