Game master starts a round

❓ Game master starts a round (click on the "Start" button):

1. _qd-ui -> fe-service:

   {
       to: 'front-service',
       message: {
           name: 'round.start'
       }
   }

2. fe-service --> redemption:

   {
       to: 'state-service',
       message: {
           name: 'round.start',
           sessionId: 'rsconf-2017'
       }
   }

3. redemption --> zandbak-service:

   {
       to: 'sandbox-service',
       message: {
           name: 'sandbox.set',
           input{JSON}: '[]',
           expected{JSON}: '[]',
           hidden: [
               { input{JSON}: '[][]', expected{JSON}: '[][]' }
           ]
           settings: {
               timeout: 50,
               reloadWorkers: false,
               refillWorkers: false
           }
       }
   }

4. redemption --> fe-service:

   {
       to: 'front-service',
       message: {
           name: 'roundPhase.changed',
           roundPhase: "countdown",
           sessionId: 'rsconf-2017'
       }
   }

5. fe-service -> _qd-ui:

   {
       to: '_qd-ui',
       message: {
           name: 'roundPhase.changed',
           roundPhase: 'countdown'
       }
   }

6. redemption --> fe-service:

   {
       to: 'front-service',
       message: {
           name: 'startCountdown.changed',
           startCountdown: 3,
           sessionId: 'rsconf-2017'
       }
   }

7. fe-service -> _qd-ui:

   {
       to: '_qd-ui',
       message: {
           name: 'startCountdown.changed',
           startCountdown: 3                
       }
   }

   Steps 6. and 7. are repeated until startCountdown is 0 (including).

8. redemption --> fe-service:

   {
       to: 'front-service',
       message: {
           name: 'roundPhase.changed',
           roundPhase: "in-progress",
           sessionId: 'rsconf-2017'
       }
   }

9. fe-service -> _qd-ui:

   {
       to: '_qd-ui',
       message: {
           name: 'roundPhase.changed',
           roundPhase: "in-progress"
       }
   }

10. redemption --> fe-service:

```js
{
    to: 'front-service',
    message: {
        name: 'puzzle',
        input: '[]',
        expected: '{}',
        sessionId: 'rsconf-2017'
    }
}
```

11. fe-service -> _qd-ui:

    {
        to: '_qd-ui',
        message: {
            name: 'puzzle',
            input: '[]',
            expected: '{}' 
        }
    }

12. redemption --> fe-service:

    {
        to: 'front-service',
        message: {
            name: 'roundCountdown.changed',
            roundCountdown: 180,
            sessionId: 'rsconf-2017'
        }
    }

13. fe-service -> _qd-ui:

    {
        to: '_qd-ui',
        message: {
            name: 'roundCountdown.changed',
            roundCountdown: 180
        }
    }

    Steps 12. and 13. are repeated until roundCountdown reaches 0 OR round is stopped by game master (go to step 4 in the next flow).