Merge pull request #956 from normanjaeckel/Fix940

Add error message if a invalid answer was send via POST to a QuestionVie...
Fix for wrong format of clock and countdown on projector
use the server_time for countdown and clock
Merge pull request #960 from ostcar/time_format

Time format
Fixed reload of javascript
Merge pull request #967 from ostcar/fix_projectot_reload

Fixed reload of javascript
New command create-dev-settings. Clean up main script. Fix wrong path for Windows version.
Review1
Fix test.