Twenty Fourteen: enhance main navigation usability by adding in visual indicators for existence of submenu items. Props binarymoon, iamtakashi. Fixes #26200.
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wp_list_categories(): Add cat-item-none and cat-item-all classes to the none/all options.

props SergeyBiryukov.
fixes #24428.

Built from https://develop.svn.wordpress.org/trunk@26588


git-svn-id: http://core.svn.wordpress.org/trunk@26478 1a063a9b-81f0-0310-95a4-ce76da25c4cd