Merge pull request #118 from hyperium/headers-clone

make Headers implement Clone

benches/client.rs

@@ -44,6 +44,7 @@ fn bench_curl(b: &mut test::Bencher) {
     listening.close().unwrap()
 }
 
+#[deriving(Clone)]
 struct Foo;
 
 impl hyper::header::Header for Foo {

benches/client_mock_tcp.rs

@@ -68,6 +68,7 @@ fn bench_mock_curl(b: &mut test::Bencher) {
     });
 }
 
+#[deriving(Clone)]
 struct Foo;
 
 impl hyper::header::Header for Foo {