New contract for the functions with request and response

[pedrosnk]

Let's create a new contract to execute the functions that we can encapsulate the request and the response of our requests and pass it forward to our functions.

the new way to write functions will be

function foo(request, response) {
  response.status(200).send({"response": "ok"})
}

The request object will contain the body that will indicate the body of the request the headers, which will contains the request headers and the query with the query string from the request.

The response object will contain the send method which will be invoked when it is needed to send back a response, the status method that will be used to set the status of the response and the set that will be used to set the headers of the response.