fixes #2822: Post vote API: returns 200 for both success and failure; fixes bug with x-api-limit header

app/controllers/comment_votes_controller.rb

@@ -1,11 +1,14 @@
 class CommentVotesController < ApplicationController
   respond_to :js, :json, :xml
   before_filter :member_only
+  skip_before_filter :api_check
 
   def create
     @comment = Comment.find(params[:comment_id])
     @comment_vote = @comment.vote!(params[:score])
-    respond_with(@comment_vote)
+  rescue CommentVote::Error, ActiveRecord::RecordInvalid => x
+    @error = x
+    render status: 500
   end
 
   def destroy
@@ -13,5 +16,6 @@ class CommentVotesController < ApplicationController
     @comment.unvote!(params[:score])
   rescue CommentVote::Error => x
     @error = x
+    render status: 500
   end
 end