Rails app with AJAX/jQuery reproducing stack overflow basic functionality: --users can create accounts

--users can post questions

--users can post answers to questions (AJAX/jQuery provides dynamic page response)

--user who posts a question can select an answer as the chosen answer (AJAX/jQuery provides dynamic page response)

--users can upvote answers (AJAX/jQuery provides dynamic page response)

--answers are sorted by 1) chosen answers first, then 2) answers with highest upvotes

--users can do a basic search of questions