Use the bytes crate for backend message parsing (#253)

Author: sfackler

postgres-protocol/Cargo.toml

@@ -9,6 +9,7 @@ documentation = "https://docs.rs/postgres-protocol/0.2.2/postgres_protocol"
 readme = "../README.md"
 
 [dependencies]
+bytes = "0.4"
 byteorder = "1.0"
 fallible-iterator = "0.1"
 md5 = "0.3"

postgres-protocol/src/lib.rs

@@ -11,6 +11,7 @@
 //! set to `UTF8`. It will most likely not behave properly if that is not the case.
 #![doc(html_root_url="https://docs.rs/postgres-protocol/0.2.2")]
 #![warn(missing_docs)]
+extern crate bytes;
 extern crate byteorder;
 extern crate fallible_iterator;
 extern crate md5;