Made quotes consistent

One-off use of double quotes aggravated my OCD.

Author: lennym

bin/express

@@ -236,7 +236,7 @@ var app = [
   , 'app.get(\'/users\', user.list);'
   , ''
   , 'http.createServer(app).listen(app.get(\'port\'), function(){'
-  , '  console.log("Express server listening on port " + app.get(\'port\'));'
+  , '  console.log(\'Express server listening on port \' + app.get(\'port\'));'
   , '});'
   , ''
 ].join(eol);