add bullet_instructure gem and config

Change-Id: I044b10725d73cabccdee07403b4fa269c1d10944
Reviewed-on: https://gerrit.instructure.com/38279
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Bryan Madsen <bryan@instructure.com>
Product-Review: Bryan Madsen <bryan@instructure.com>
QA-Review: Bryan Madsen <bryan@instructure.com>
Reviewed-by: Adam Ard <aard@instructure.com>