Merge branch 'stable-3.1' into 'stable-3.1'

Marius Burkard

2016-07-05 72cefc438c0d279be66cd95c7b42a021ae647d51

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ALTER TABLE `web_domain` ADD `last_quota_notification` DATE NULL DEFAULT NULL;
ALTER TABLE `mail_user` ADD `last_quota_notification` DATE NULL DEFAULT NULL;