User can create a Quiz, which is a bunch of Questions

[josemvidal]

• [x] Question have math (latex)
• [x] Each question has an answer
• [x] Any number of questions
• [x] Can Delete question
• [x] Questions have keywords

[josemvidal]

This is not working.

I created quizes (it crashed when adding a question, see #49 ) but none are listed:

So I am re-opening.

[josemvidal]

works in new version.