"Fix on the Run"-Update

- Timetable: current Week gets now correct selected

- Mensa: Addititves 50/58 removed from List, some clean up,
  Loading-Spinner corrected, no Meals this Week/Day -> Hint added

Closes #35
Part of #40

- Sport: removed old Source Code, new Informations added,
  Style of Images moved to CSS, some clean up, hr after Description
  removed (deprecated, should be replaced by CSS)
  
Closes #41
Part of #40

- fn.js: some clean up, some little fixes, 
  correcting openInExternalBrowser-Function (should work, please check)
  
#37