Merge branch 'release/v0.3.2' into production
Merge tag 'v0.3.2' into develop

hw3 part2
DOC add tips for git push

	modified:   startup_engineering.leo
ENH add note modules cheerio and commander

	new files:   node_modules/cheerio/*
	new files:   node_modules/commander/*
ENH add initial versions of grader.js and checks.json

	new file:   checks.json
	new file:   grader.js
	modified:   startup_engineering.leo
ENH add test/ from "Hints and Tips"

	new file:   test/checks-test-1.json
	new file:   test/checks-test-2.json
	new file:   test/test1.html
	new file:   test/test2.html
ENH update checks.json

	modified:   checks.json
ENH add module restler

	new files:   node_modules/restler/*
ENH refactoring grader.js