Twenty Fourteen: further revise primary navigation functionality, simplify mobile navigation, and clean up the main JS file. Props obenland, iamtakashi. See #25554.
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Twenty Fourteen: use SVG images instead of CSS3 gradients for featured image background pattern. Props iamtakashi.

 * Fixes laggy loading in Firefox, see #25600.
 * Significantly reduces CPU usage.
 * Scalable and crisp on HiDPI/retina screens.
 * SVG is support in IE9 which doesn't support CSS gradients.
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Updates: Disable maintenance mode once we've finished copying files, to minimize disruption.

props dd32.
fixes #25655.

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git-svn-id: http://core.svn.wordpress.org/trunk@25778 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Always apply the posts_search filter. Restores 3.6 behavior.

props SergeyBiryukov.
fixes #25664.

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Spell out duplicate hook locations.

props DrewAPicture.
fixes #25658.

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Only enforce disk free space checks when doing background updates.

see #25652.

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New, better error message when we realize we won't be able to copy a file and continue with the update.

fixes #25652.

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"some files" instead of "certain files". Less stuffy.

props markjaquith.
see #25652.

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