Issue #365, add logging setting for production.

I simply add a format to express.logger. This should be used by switching <pre>app.use(express.logger('dev'))</pre> to <pre>app.use(express.logger('production'))</pre>.
I'm not sure if this is the best way since the plugin's source code was changed, this makes it more difficult to update from original source. Please have a look, any feedback would be appreciated.