Merge pull request #34 in ZP/z-push from bugfix/ZP-672-options-without-authentication-info to develop

* commit '0db8a314':
  ZP-672 Always require Authentication header. Released under the Affero GNU General Public License (AGPL) version 3.
  ZP-672 Options without authentication info. Released under the Affero GNU General Public License (AGPL) version 3.

(cherry picked from commit 22dd9503)