Make failing spec pass by allowing authors to see their own usernames.

api/comment_threads.rb

@@ -16,7 +16,7 @@ get "#{APIPREFIX}/threads/:thread_id" do |thread_id|
   thread = CommentThread.find(thread_id)
 
   if params["user_id"] and bool_mark_as_read
-    user = User.only([:id, :read_states]).find_by(external_id: params["user_id"])
+    user = User.only([:id, :username, :read_states]).find_by(external_id: params["user_id"])
     user.mark_as_read(thread) if user
   end