Clean up default server

It turns out you don't have to call @on to have immediate access to @io, so I removed that.

Also, the default log level for @io is jacked up high, so I lowered it to 1 to be more like what people get out of the express server (plus it's a neat line of code that people often ask about).

Finally, and most importantly, I pass @server (not @app) to the callback because server-reload expects the close() method.