Update for opt in Copy changes

Author: sfackler

src/lib.rs

@@ -15,6 +15,7 @@ use postgres::{IntoConnectParams, SslMode};
 use postgres::types::ToSql;
 
 /// A unified enum of errors returned by postgres::Connection
+#[deriving(Clone)]
 pub enum Error {
     /// A postgres::ConnectError
     Connect(postgres::ConnectError),
@@ -115,6 +116,7 @@ impl r2d2::PoolManager<postgres::Connection, Error> for PostgresPoolManager {
 }
 
 /// Configuration options for the `CachingStatementManager`.
+#[deriving(Copy, Clone)]
 pub struct Config {
     /// The number of `postgres::Statement`s that will be internally cached.
     ///