Created a new votes controller. Has two methods, answer_upvote, and answer_downvote
	new file:   app/controllers/votes_controller.rb

Created a Vote model that uses a polymorphic relationship with answer
	modified:   app/models/vote.rb

Updated links and took out your locals hash as it wasn't doing anything at all...
Added buttons for upvote and downvote.
	modified:   app/views/questions/show.html.erb

Added nested post routes for upvote and downvote

	modified:   config/routes.rb