Merge remote-tracking branch 'origin/master'

core/ArchiveProcessor.php

core/Notification.php

core/Plugin/Archiver.php

core/Plugin/ControllerAdmin.php

core/Twig.php

plugins/CoreAdminHome/templates/generalSettings.twig

plugins/CoreHome/templates/_notifications.twig

plugins/CorePluginsAdmin/Controller.php

plugins/CorePluginsAdmin/templates/installPlugin.twig

plugins/CorePluginsAdmin/templates/updatePlugin.twig

plugins/ExampleUI/Controller.php

plugins/Login/Controller.php

plugins/Referrers/Referrers.php

plugins/Zeitgeist/javascripts/ajaxHelper.js

plugins/Zeitgeist/templates/ajaxMacros.twig

tests/PHPUnit/UI