Replace json.Marshal with json.Encoder

[Robert]

On the foundation -> web -> response.go we have:

// Convert the response value to JSON.
	jsonData, err := json.Marshal(data)
	if err != nil {
		return err
	}

Wouldn't be this version better? Could be considered an over-optimization?

// Convert the response value to JSON.
	e := json.NewEncoder(w)
	err := e.Encode(data)
	if err != nil {
		return err
	}

[William Kennedy]

I don't know why I didn't use this form, thought it would be all in one line

if err := json.NewEncoder(w).Encode(data); err != nil {

I think I like what I have because it breaks up the marshalling from the write. In some projects I like to use MarshalIndent to make the output more easy to read. If you wanted to do this, I would do it after the call to w.WriteHeader

[William Kennedy]

I ran a test and I lost some control over the response. I don't know enough to understand the API again and I really don't have time. I think I will keep those two parts separated.