move evaluate_for into the progression object

Change-Id: I94f6a66348827b7138ca0e5e1d45008b17f79894
Reviewed-on: https://gerrit.instructure.com/30981
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Matt Fairbourn <mfairbourn@instructure.com>
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
Product-Review: Jeremy Stanley <jeremy@instructure.com>