add CRUD for multiple choice answers
allow answers to be submitted for mc questions
missing commas in json
typo, existant->existent
ensure multiple choice answers are valid for their question
mark trigger as stable
Merge branch 'master' into feature/multiple-choice-answers

Conflicts:
	backend/src/backend/questions/models.py
add question_group to question & allow filtering by question_group
opps -- remve .swp file