chore(nightly): remove ()'s and fix benchmarks for nightly

Also ensure that `cargo bench` runs successfully on travis; the old
`cargo bench ... || :` has the effect of ignoring any errors in it.

benches/client.rs

@@ -7,6 +7,8 @@ extern crate test;
 use std::fmt;
 use std::io::{self, Read, Write, Cursor};
 use std::net::SocketAddr;
+#[cfg(feature = "timeouts")]
+use std::time::Duration;
 
 use hyper::net;
 
@@ -73,6 +75,16 @@ impl net::NetworkStream for MockStream {
     fn peer_addr(&mut self) -> io::Result<SocketAddr> {
         Ok("127.0.0.1:1337".parse().unwrap())
     }
+    #[cfg(feature = "timeouts")]
+    fn set_read_timeout(&self, _: Option<Duration>) -> io::Result<()> {
+        // can't time out
+        Ok(())
+    }
+    #[cfg(feature = "timeouts")]
+    fn set_write_timeout(&self, _: Option<Duration>) -> io::Result<()> {
+        // can't time out
+        Ok(())
+    }
 }
 
 struct MockConnector;