Do not to call app.address() before listening event

According to nodejs/node-v0.x-archive@d3f6b09,
call to `net.Server.address()` should happen only after `net.Server`
emits `listening` event.

Author: mmalecki

bin/express

@@ -185,8 +185,9 @@ var app = [
   , ''
   , 'app.get(\'/\', routes.index);'
   , ''
-  , 'app.listen(3000);'
-  , 'console.log("Express server listening on port %d in %s mode", app.address().port, app.settings.env);'
+  , 'app.listen(3000, function(){'
+  , '  console.log("Express server listening on port %d in %s mode", app.address().port, app.settings.env);'
+  , '});'
   , ''
 ].join(eol);