Puh, Quizzes exist now and are linked to questions. Had to change a shitton about the data models; year and category now live in the quizzes table, since I realized that questions can actually only belong to one set of these parameters, which in turn represents one single quiz... well, well, well.
Alright, quizzes can now be created and edited with questions and answers right away. Puh. Merging this into master now.
Merge branch 'quiz'