module timer today (maybe OK)

- add first draft of module timer with seven state

- refactoring interface for studentLogin (with .css and .js)
- add countdown into index.html; for implementing this, I use the js library countdown_v5.0 (I put it inside del folder public > js > myjsbin)
- into routes.js I add path /getClockAula and /setClockAula to get and set the status of the clock aula
- into controlPanelProf I insert sector for manage the classroom clock, so I changed .js and .html file

for tomorrow ==> Happy Birthday Miki and Marty, you came of eges (maggiorenni, I could not find good translation)