step1: create simple server that responds with Hey World! for any request

Change-Id: I5fb812733bbae88c47baf14dd64325fb47e29d54
Merge branch 'step1' of github.com:dshkolnikov/nodejs-intro into step1

Conflicts:
	server.js

Change-Id: Ie03999f5e98033662ea3e8cd084eeec61719d7f1