Updates required because of version changes

[shelagh-lewins-ucl]

This is a great example, thank you so much - I couldn't have got my code working without it.
I had to change a few things in the code because of version changes.

1. meteor-node-stubs now uses stream-http instead of http-browserify
   [bug] Update to 0.3.3 causes error on the client. meteor/node-stubs#14

So the 'hack' fix to Response in the client code isn't needed, and in fact causes an error:

Error: Cannot find module 'meteor-node-stubs/node_modules/http-browserify/lib/response'

I had to update meteor-node-stubs because the version of stream-http it included used the Buffer polyfill which is no longer included in Meteor by default:

meteor/meteor@6f75eae

2. On the server, I had to change:

import http from 'http';

to:

const http = require('http');