upgrade rspec 2

Change-Id: I9e2658722af444df3626fb06ec5877f189e80643
Reviewed-on: https://gerrit.instructure.com/28702
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: James Williams  <jamesw@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>