+Debug exam mode (and open too...): Vue.js warning + shift questions (not showing solution)
+
Replace underscore by lodash (or better: ES6)
Replace socket.io by Websockets ( https://www.npmjs.com/package/websocket )
compute grades after exam (in teacher's view)
factorize redundant code in course.js, monitor.js and (TOWRITE) grade.js
(showing students list + grades or papers)
+monitoring: main teacher should not be asked for pwd, and button "send feedback" hidden for others
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