Twenty Fourteen: full-width page template should display a full-width featured image, except for mobile. Fixes #25925, props iamtakashi.
Built from https://develop.svn.wordpress.org/trunk@26098


git-svn-id: http://core.svn.wordpress.org/trunk@26013 1a063a9b-81f0-0310-95a4-ce76da25c4cd