Missing import of domain

fixes #120

Author: mattrobenolt

lib/middleware/connect.js

@@ -27,6 +27,7 @@ connectMiddleware.errorHandler = function(client) {
 // Ensures asynchronous exceptions are routed to the errorHandler. This
 // should be the **first** item listed in middleware.
 connectMiddleware.requestHandler = function(client) {
+    var domain = require('domain');
     return function(req, res, next) {
         var reqDomain = domain.create();
         reqDomain.on('error', next);