Merge remote-tracking branch 'origin/master'
Merge remote-tracking branch 'origin/origin/master'
Merge remote-tracking branch 'origin/origin/master'
Merge remote-tracking branch 'origin/origin/master'
Merge remote-tracking branch 'origin/origin/master'

Change-Id: I39bd6952a8c3b37860885d38f8d9f342602d5798
Merge remote-tracking branch 'origin/origin/master'
QuizOpdracht verder uitgebouwd + method in Opdracht en Quiz classes