Update README.md

Added more detailed information.
Update README.md

app.js exports module, which www uses.
Merge branch 'master' of https://github.com/Zappeion/athens
Update README.md

Added note to requirements and updated run instructions.
Update README.md
Update README.md

showcasing pull
Starting API design.
	modified:   app/api.js
Restructuring files in project.
	renamed:    config/database.js -> app/config/database.js
	renamed:    config/passport.js -> app/config/passport.js
	new file:   public/index.html
	modified:   server.js