Removed 'end' event listener.

The example did not work out of the box. I traced the problem to the `'end'` event listener attached to request.

I guess older versions of node.js required this but as of 0.10.0 (probably earlier), the `createServer` callback isn't called until `request` has already completed.

Therefore, there is no need for the `'end'` event listener anymore.

Also, I removed some unnecessary parentheses.