Update for upstream changes

Author: sfackler

src/lib.rs

@@ -67,7 +67,6 @@ fn main() {
 extern crate collections;
 extern crate openssl;
 extern crate serialize;
-extern crate sync;
 extern crate time;
 extern crate phf;
 #[phase(plugin)]

src/pool.rs

@@ -1,6 +1,6 @@
 //! A simple connection pool
 
-use sync::{Arc, Mutex};
+use std::sync::{Arc, Mutex};
 
 use {PostgresNotifications,
      PostgresConnectParams,

src/test.rs

@@ -1,6 +1,6 @@
 use serialize::json;
-use sync;
-use sync::Future;
+use std::comm;
+use std::sync::Future;
 use time;
 use time::Timespec;
 use uuid::Uuid;
@@ -54,7 +54,7 @@ fn test_pool() {
     let pool = or_fail!(PostgresConnectionPool::new("postgres://postgres@localhost",
                                                     NoSsl, 2));
 
-    let (stream1, stream2) = sync::duplex();
+    let (stream1, stream2) = comm::duplex();
 
     let pool1 = pool.clone();
     let mut fut1 = Future::spawn(proc() {