Initialize the filter globals.

props rmccue.
fixes #25378.

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Make sure the attachment file exists before calling filesize() on it. props DrewAPicture. fixes #25170.

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Clarify inline documentation for the return in `get_attached_file()`.

Fixes #25409.

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Twenty Fourteen: redo the featured image background pattern with CSS plus minor style adjustments.  Props iamtakashi, fixes #25300. This also fixes #25363, props buffler.
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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.
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Twenty Fourteen: fixes for accent color functionality, props celloexpressions. See #25220.

 * Apply the primary accent color to the current-time indicator for the `mediaelements` players.
 * Fix instances of the custom accent color CSS overriding white or black link colors that should have no text-color change on hover.
 * Remove text color from main navigation hover states for submenus and from main navigation top-level items.
 * Change the background color a bit more on hover for main navigation submenus.
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Twenty Fourteen: accessibility fix for allowing the search button in the toolbar to be focused with the keyboard. Props joedolson and sabreuse, see #25054.
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Twenty Fourteen: remove unused images, following r25610. See #25300.
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Use the wpdb method instead of $wpdb->prefix.

props hakre.
fixes #16756.

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Don't rely on include_path to include files.

Always use dirname() or, once available, ABSPATH.

props ketwaroo, hakre.
fixes #17092.

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