built heroku

• $heroku login
• (first time) $cd heroku folder; $heroku create; $heroku ps:scale web=1; $heroku open
• (dev) $nodemon
• (test) $heroku local
• $git add .; $git commit -am "comment"; $git push heroku master;
• change .env
• (mongo live) (login in http://docs.mongolab.com/, then get database URI) $heroku config:set MONGOLAB_URI=your_db_uri
• heroku open to open website after git push