Merge pull request #20 from Dziolas/master

Fix for displaying delivery dates when DOI wasnt registered yet.
Compliance: Moves add- and amend_fields to compliance_check

* Due to missing generality, the functions add_fields and
  amend_fields are moved from utils.py to compliance_check.py

Signed-off-by: Martin Vesper <martin.vesper@cern.ch>
Compliance checks: fixes

* fixes displaying compliance checks when no doi registration date,

* fixes creating a path for looking for compliance settings.