Bug1100916 answer a question helper

@Rik r?
Renaming questions.html and questions_list.html should be done in this pull request (I'm thinking helpee_questions.html and helper_questions.html but if you have better names, go for it).
I also think creating a question.html view (to display a question) should be done in this pull request. Just because we're duplicating code otherwise. It can be done in a separate commit inside this pull request if you prefer. No need to do the list_with_day part in this pull request.
We can certainly discuss the idea of a tabbed view for helpees too. But that would take some time to get agreed.