Print full stack trace of error in BatchItemProcessingJob.rescue_from

[afred]

Because: right now it has the following behavior...

1. Save the error message to hyrax_batch_items.error field.
2. If you are in "development" environment, tack on the stack trace.

This has the effect of being to expose the stack trace through the web UI when developing.

But this falls short when you are debugging in a "production" env (i.e. on a staging server). You want to see the stack trace, but you don't necessarily want it exposed in the UI, nor do you want to switch to "development" rails environment.

Done when: full stack trace is sent to STDERR

[afred]

Duplicate of #131