Merge branch 'dev'
Sooooo many changes. Beautification of tons of stuff has happened, we now have a bit more functionality for admins and a few more forms. Also the data model for questions and answers is complete and questions can be added with answers and answers can be marked as being correct. Deletion is also possible. I'm sure I'm forgetting quite a few things right now. Next steps are: Implement a functionality to become an admin via a global password and then, of course, the quiz functionality itself.
Merge branch 'dev'
What we have right now runs. Questions and answers can be added, edited and deleted; so can users.
'Bug' right now: If one clicks on the "Become admin" button in the My Profile modal window, Rails complains because there's now POST route for root.
The merge is technically not necessary, but this is a stage I'm comfortable to share with people and most people only look at the master branch.
Merge branch 'dev'

Conflicts:
	app/views/layouts/application.html.erb
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'
Some earlier changes were lost, I don't exactly understand why tbh.