ruby 2.1 is tested automatically now

even if it hasn't had a full manual regression check on it

Change-Id: Ia9275c1fe95236b750b602e34727d7cd2caf2936
Reviewed-on: https://gerrit.instructure.com/38603
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Brian Palmer <brianp@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>