Add creation/update times to qanswers

db/schema.rb

@@ -277,6 +277,8 @@ ActiveRecord::Schema.define(version: 20141130182139) do
   create_table "qanswers", force: true do |t|
     t.integer "question_id"
     t.integer "answer_id"
+    t.datetime "created_at"
+    t.datetime "updated_at"
   end
 
   create_table "qanswers_registrations", id: false, force: true do |t|