Question & Answers administration

[andreslucena]

This PR is the second part of the decidim-elections extraction.

In this case, we're extracting the administration of the models Questions & Answers.

Fixes #6

Testing

• [ ] As an administrator I can create a question inside an election
• [ ] As an administrator I can update a question inside an election
• [ ] As an administrator I can delete a question inside an election
• [ ] As an administrator I can create answers related to a question
• [ ] As an administrator I can update answers related to a question
• [ ] As an administrator I can delete answers related to a question

[andreslucena]

This is ready to be reviewed again @microstudi A few comments:

• there were a few more factories that we needed to change
• as we're only changing the factory name and not the association name, I also needed to change it in the factories definition at 0a83cd19c222af1a25987fe28193ede97deb13e3
• as the "publicable" shared example tries to infer the factory name from the model name, I needed to change that too. There are more details at 96dd7dbae789a8f466b320d0fe2794e947805a9d

[andreslucena]

I found a little one more to be rename (I think, see the comment)

Accepted the suggestion @microstudi, it's at 3b066d0e9877022af40fbf6313d3a693a24fbf80