Add req.connection and res.connection

lib/http.js

@@ -170,7 +170,10 @@ var contentLengthExpression = /Content-Length/i;
 function IncomingMessage (socket) {
   events.EventEmitter.call(this);
 
+  // TODO Remove one of these eventually.
   this.socket = socket;
+  this.connection = socket;
+
   this.httpVersion = null;
   this.headers = {};
 
@@ -221,7 +224,9 @@ IncomingMessage.prototype._addHeaderLine = function (field, value) {
 function OutgoingMessage (socket) {
   events.EventEmitter.call(this, socket);
 
+  // TODO Remove one of these eventually.
   this.socket = socket;
+  this.connection = socket;
 
   this.output = [];
   this.outputEncodings = [];