Add questions and answers migrations
Initial question and answer model
Initial crud of questions
rspec of question model
rspec of answer model
Add basic crud of answers
Change answer creation link
Remmove unused files
Remove before(:all)
Rspec: change order by id into vote_sum in answer spec
rspec: order by vote_sum for answer
rspec: vote up and vote down
Initial answer_vote model
Add answer_votes migration
Add vote_sum field into answers table
Add default value of vote_sum
Initial answer_votes controller
Add up and down in answer_vote model
change kind_changed into kind_changed?
Rspec: Fix answer_vote