Make Guard coffeescript compilation include line numbers when the build fails

Change-Id: If06afc8db7d13c9ecd7737e452dfef7eba32e4e2
Reviewed-on: https://gerrit.instructure.com/45581
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>
Product-Review: Jon Jensen <jon@instructure.com>
QA-Review: Jon Jensen <jon@instructure.com>