Updated Schemas, and fixed some bugs in earlier version of them.
 Changes to be committed:
	modified:   app/api.js
	deleted:    app/config.js
	modified:   app/models/course.js
	new file:   app/models/helpers.js
	modified:   app/models/question.js
	modified:   app/models/user.js
	modified:   app/public/index.html
	modified:   app/public/js/sos.js
	modified:   app/server.js