Fix a bug in pkg/http where exceptions were getting top-leveled.

pkg/http/lib/src/io_client.dart

Index: pkg/http/lib/src/io_client.dart
diff --git a/pkg/http/lib/src/io_client.dart b/pkg/http/lib/src/io_client.dart
index 8cc775a351a46764eba084a1185ff6d613beeb61..764a215ec914568ad8fbeb765bc537137d9963cb 100644
--- a/pkg/http/lib/src/io_client.dart
+++ b/pkg/http/lib/src/io_client.dart
@@ -73,7 +73,10 @@ class IOClient extends BaseClient {
           reasonPhrase: response.reasonPhrase));
     };
 
-    return pipeCompleter.future.then((_) => completer.future);
+    return Futures.wait([

[floitsch, 2013/01/09 17:48:31]

We are going to remove the Futures class.
We have created new Future.wait(...) to replace this static method.

[nweiz, 2013/01/09 21:03:40]

Done.

+      completer.future,
+      pipeCompleter.future
+    ]).then((values) => values.first);
   }
 
   /// Closes the client. This terminates all active connections. If a client