Refactoring via extract method

The unzip job has duplicate/common behavior with
Sufia::GenericFile::Actions.create_metadata; This is a first step for
consolidating this.
Merge pull request #99 from jeremyf/extract-method-unzip-job

Refactoring via extract method
Fixing batch edit delete for the latest session less hydra-batch-edit
Merge pull request #100 from psu-stewardship/bedel_fix

Fixing batch edit delete for the latest session less hydra-batch-edit