message: add response to GetBlock
diff: @@ -311,6 +311,8 @@ impl de::Deserialize for GetBlocks {
  }
  }
  +pub type Block = block::block::Block;
  +
  #[cfg(test)]
  fn random_headerhash<G: ::quickcheck::Gen>(g: &mut G) -> HeaderHash {
  let bytes: Vec<u8> = ::quickcheck::Arbitrary::arbitrary(g);
  