server.js send404 function should send debug data

As per beejeebus' request, I'm moving this here.

server.js's send404 function at line 410:

var send404 = function (request, response) {
  response.send('Not Found.', 404);
};

should send a message to console.log if the server is in debug mode. I had a server misconfig on my node.js server that was completely invisible because there was no error generated.