added security to controllers
Merge branch 'master' of https://github.com/MKBid/TUBE.git

Conflicts:
	controllers/admintools_controller.php
	controllers/reacties_controller.php
	controllers/resultaten_controller.php
	controllers/sitebeheer_controller.php
	controllers/vacatures_controller.php
	controllers/werkgevers_controller.php
	controllers/zzpers_controller.php