Add a class to the bulk actions wrapper div. props nofearinc. fixes #25197.

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Twenty Fourteen: first pass at adding a Contributors page template to highlight authors. Props MikeHansenMe, iamtakashi, obenland, and Kuzmanov. See #24863.
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git-svn-id: http://core.svn.wordpress.org/trunk@25430 1a063a9b-81f0-0310-95a4-ce76da25c4cd