Twenty Fourteen: redo the featured image background pattern with CSS plus minor style adjustments.  Props iamtakashi, fixes #25300. This also fixes #25363, props buffler.
Built from https://develop.svn.wordpress.org/trunk@25610


git-svn-id: http://core.svn.wordpress.org/trunk@25527 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: fix gap beneath header image, props taupecat. Fixes #25404.
Built from https://develop.svn.wordpress.org/trunk@25611


git-svn-id: http://core.svn.wordpress.org/trunk@25528 1a063a9b-81f0-0310-95a4-ce76da25c4cd