Modified to be able to harvest from Consyn

* contrast_out_utils
* elsevier_package: fixes on _build_journal_mappings function.
* elsevier_package: fixes on get_references function.
* elsevier_package: import fixes.
* elsevier_package: fixes in get_publication_information.
* elsevier_package: adds a new case for the label harvesting to remove.
  the ending parenthesis.