Trajectschedular voor admin (met API-calls), needs fixes
Merge branch 'master' of https://github.com/CalZoneVUB/CalZone

# By Timbo925
# Via Timbo925 (2) and Christophe Gaethofs (1)
* 'master' of https://github.com/CalZoneVUB/CalZone:
  Frozen trajecten
  Fix
  API not frozen list
  Small bug fixes and cleanup
  Constraints Api's
Show constraints in sidebar
Merge branch 'master' of https://github.com/CalZoneVUB/CalZone

# By Timbo925 (2) and nicocarraggi (2)
# Via Timbo925
* 'master' of https://github.com/CalZoneVUB/CalZone:
  fix
  Constraints to Json
  onnodige comments verwijderd.
  Issue #252 opgelost.
Merge pull request #258 from gaethofs/master

Contraints in schedular voor admin