Add thumbnails to README
Correct message link color
Correct session description
Add a main script

Heroku uses ‘main’ to determine the startup script.
Heroku port sensitivity

Heroku uses random high ports for staging/production, allow for env port to be set externally
Heroku port sensitivity

Heroku uses random high ports for staging/production, allow for env port to be set externally
Upstream Merge: merge branch 'master' of github.com:ppuleo/mean-seed

* 'master' of github.com:ppuleo/mean-seed:
  Heroku port sensitivity
  Heroku port sensitivity
  Add a main script
  Correct session description
  Correct message link color
  Add thumbnails to README

Conflicts:
	README.md
	package.json
	server/server.js
Fix upstream merge overwrite