comment post
Merge commit '2d89ca2af43233d5642e0cec7c6e93d98c6ab644' into ryokajiwara
Merge commit 'e33a41d0e5127f7fbc466a2cb82d81e42e0d0fb4' into ryokajiwara
add upvote/downvote on Question show page
Merge commit '3f4108d891c2903b8864c5cfa7ec3af14ae981be' into ryokajiwara

Conflicts:
	app/controllers/questions_controller.rb
	config/routes.rb
fix method name
fix view