(Maint) Remove unused task

With changes to the way that the jenkins builds work we no longer need
to poll the downstream jobs to find errors.

This also cleans up the acceptance_artifacts task to use the rake
commands rather than relying on the shell so much.
(Maint) Record information about who created the artifact

It is useful to have some information about the artifact creation, so
that we can track it down later.
Merge pull request #2010 from zaphod42/maint/record-artifact-creator

(Maint) Record information about who created the artifact