Twenty Twelve: show featured image in single page views. Fixes #22943, props MikeHansenMe.

git-svn-id: http://core.svn.wordpress.org/trunk@23471 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Twelve: better layout for floated image captions. Fixes #23147.

git-svn-id: http://core.svn.wordpress.org/trunk@23472 1a063a9b-81f0-0310-95a4-ce76da25c4cd
POT, generated from r23472

git-svn-id: http://core.svn.wordpress.org/trunk@23473 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Eleven: ensure `twentyeleven_url_grabber()` is pluggable by wrapping in a `function_exists` check.

git-svn-id: http://core.svn.wordpress.org/trunk@23474 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Ten: better color contrast for links and text, props elfin. Fixes #14794.

git-svn-id: http://core.svn.wordpress.org/trunk@23475 1a063a9b-81f0-0310-95a4-ce76da25c4cd