exit 1 when ginkgo fails
exit 1 when ginkgo fails

- Powershell scripts don't do this by default and even if you tell them
to, it doesn't always work with exe(s). So checking the exit code
manually is the best practice.

Signed-off-by: Eli Wrenn <0a41924cabfa000cd7baec4cd10fadeb2f8e7ed3@pivotal.io>

cloudfoundry/cli,cloudfoundry/cli,cloudfoundry/cli