Add integration Ids to API

fixes SIS-135
fixes SIS-136

Change-Id: Ide2f51765c76a50f09d54d2865357b5ff38bc360
Reviewed-on: https://gerrit.instructure.com/28587
Reviewed-by: Duane Johnson <duane@instructure.com>
Tested-by: Duane Johnson <duane@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Jeremy Putnam <jeremyp@instructure.com>
Product-Review: Eric Adams <eadams@instructure.com>