Finalize with unit tests (if needed) and apply for Drupal Security Advisory Coverage

[kylehuynh205]

• https://www.drupal.org/project/projectapplications
• https://groups.drupal.org/code-review
• https://www.drupal.org/node/1011698
• https://www.drupal.org/node/539608
• https://www.drupal.org/docs/develop/managing-a-drupalorg-theme-module-or-distribution-project/security-coverage/reviewing-3
• https://www.drupal.org/node/1587704
• https://www.drupal.org/docs/automated-testing/phpunit-in-drupal