mark models returned from old versions as not new records

rails 3 optimizes to not do certain operations on new records,
breaking things

Change-Id: I9dea310f042cc1713e1693b353bf8c35ffe3c840
Reviewed-on: https://gerrit.instructure.com/28721
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: James Williams  <jamesw@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>