FIX: serialize post processing

This avoids all sorts of nasty race conditions in job schedular

lib/cooked_post_processor.rb

@@ -16,12 +16,14 @@ class CookedPostProcessor
   end
 
   def post_process(bypass_bump = false)
+    DistributedMutex.synchronize("post_process_#{@post.id}") do
       keep_reverse_index_up_to_date
       post_process_images
       post_process_oneboxes
       optimize_urls
       pull_hotlinked_images(bypass_bump)
     end
+  end
 
   def keep_reverse_index_up_to_date
     upload_ids = Set.new