update to rails 4.2.5.1, add debugging info for tracking slow queries

app/logical/moderator/tag_batch_change.rb

@@ -12,7 +12,7 @@ module Moderator
 
       CurrentUser.without_safe_mode do
         CurrentUser.scoped(updater, updater_ip_addr) do
-          ::Post.tag_match(antecedent).find_each do |post|
+          ::Post.tag_match(antecedent).where("true /* Moderator::TagBatchChange#perform */").find_each do |post|
             tags = (post.tag_array - normalized_antecedent + normalized_consequent).join(" ")
             post.update_attributes(:tag_string => tags)
           end