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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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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git-svn-id: http://core.svn.wordpress.org/trunk@25532 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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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git-svn-id: http://core.svn.wordpress.org/trunk@25533 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Clean up the path calculations in wp::parse_request().

props evansolomon for initial cleanup.
fixes #22209.

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git-svn-id: http://core.svn.wordpress.org/trunk@25534 1a063a9b-81f0-0310-95a4-ce76da25c4cd
'sanitize_user' is a filter, not an action. fixes #25411.
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git-svn-id: http://core.svn.wordpress.org/trunk@25535 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Simplify the login page viewport meta for mobile devices, so it's less restrictive on the user. Allows for developers to override if necessary via the `login_head` action. props azaozz. fixes #24777.

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git-svn-id: http://core.svn.wordpress.org/trunk@25536 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Better error messaging on install.php. props DrewAPicture, ocean90. fixes #24982.

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Live network counts of users and sites for small networks.

props adamsilverstein, jeremyfelt.
fixes #22917.

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Only show top-level items when adding pages to a User's First Nav Menu. (This is also the title of Dave's first children's book.)

props lessbloat.
fixes #25122.

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git-svn-id: http://core.svn.wordpress.org/trunk@25539 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: change the background color a bit more on hover for main navigation submenus. See #25220.
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git-svn-id: http://core.svn.wordpress.org/trunk@25540 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Twenty Fourteen: make the content sidebar optional and alter the layout to full-width if the sidebar is not active, but without adding wider featured image (for now). Props iamtakashi, closes #25031.
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Twenty Eleven: update code comments to reflect WP inline docs standards. Props DrewAPicture, see #25256.

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Twenty Twelve: simplify header image check, props obenland. Closes #25400.
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Twenty Ten: update code comments to reflect WP inline docs standards. Props DrewAPicture, closes #25256.
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Improve inline documentation for `wp_insert_post()` by adding a hash notation.

See #25412.

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