Add spec for the background failure case for the rerun formatter
Fix the background failing case for the rerun formatter.

Somehow the rerun formatter does not include any scenare when the
background fails, even though the summary says failed for all scenarios
of the feature. Including skipped feature elements fixes this (but is it
really the right fix?).
Merge pull request #655 from brasmusson/rerun-background-failure

Let the rerun formatter includes all scenarios when the background fails (v2.0)