Add question_vote rspec
Add question_vote migration
Add timestamps into answer_votes
Change kind into string in answer_votes table
Add kind into questions
Init question_vote model
Add question vote methods
Add relation between question and question_vote
Fix migration of question_vote
Refactor add_actived_at_to_question migration
Not change updated_at after save vote
Not change updated_at after save vote on answer model
user spec fix
Merge branch 'master' into bgmaster