www/drupal7: 7.28 -> 7.31

Changes:
https://www.drupal.org/drupal-7.29-release-notes
https://www.drupal.org/drupal-7.30-release-notes
https://www.drupal.org/drupal-7.31-release-notes

PR: 192099
Submitted by: simon.wright@gmx.net
Approved by: miwi (timeout)