Constrain large videos from rendering bigger than $content_width on both frontend and backend.

props wonderboymusic. fixes #23955.

git-svn-id: http://core.svn.wordpress.org/trunk@23989 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-beta1-23990.

git-svn-id: http://core.svn.wordpress.org/trunk@23990 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Constrain the width of images even when they're linked, in Twenty Thirteen.

see #23964

git-svn-id: http://core.svn.wordpress.org/trunk@23991 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Link post format images if a URL is provided. Make the URL available via get_the_post_format_url().

props wonderboymusic, obenland. fixes #23964.

git-svn-id: http://core.svn.wordpress.org/trunk@23992 1a063a9b-81f0-0310-95a4-ce76da25c4cd