spec: add moodle 2 converter specs

Change-Id: I4033273789a7ef65ce2d86cbec7c9e47eff8a0ba
Reviewed-on: https://gerrit.instructure.com/37902
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
Product-Review: Jeremy Stanley <jeremy@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>