fix copy/paste from rails 2 code

Relation in Rails 3, not Scope

Change-Id: I523fd79590f3c05f9c4cf704af2942632fc760d9
Reviewed-on: https://gerrit.instructure.com/37618
Reviewed-by: James Williams  <jamesw@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
bump version

Change-Id: Ibc6deab26dfcd8d7a4aa8642720b5a9eac6c6f59