Issue #2359453 by JeroenT: Remove drupal_mail_system()
git commit -m 'Issue #2377397 by Wim Leers, alexpott: Themes should use libraries, not individual stylesheets'
Issue #2358603 by Berdir: ViewsAjaxController results in fatal error for empty optional arguments
Issue #2212335 by jhodgdon: Separate out NodeSearch::execute() into finding vs. processing results