Move to grunt-sass, which which has less bells and whistles than grunt-contrib-sass but also no Ruby dependency.

see #25858, #22862, [26143].

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Avoid a notice when SCRIPT_DEBUG is not defined. props MikeHansenMe. see #25824, #25858.

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Remove SCRIPT_DEBUG reference from register_admin_color_schemes().

Instead, script-loader.php handles converting .min.css to .css when SCRIPT_DEBUG is on, and has since r21592. (This was done for compatibility with plugin color schemes that used .css and .dev.css.)

see #25858.

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Background Updates: Fix a PHP Fatal error which could be encountered on some systems when using FTP. Fixes #25817 for trunk.

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Background Updates: Spread them over the hour. Props Pento. Fixes #25833 for trunk 

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Twenty Fourteen: make sure styles for featured content on a static page are limited to posts within the main content area. Props iamtakashi, fixes #25938.
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Twenty Fourteen: remove unused class name, props obenland. See #25946.
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Twenty Fourteen: simplify and prefix post thumbnail sizes, props obenland. See #25946.
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Twenty Fourteen: first pass at adding help text to to "Help" tab for `edit.php` and `themes.php` screens. Props obenland for starter patch, see #25837.
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Twenty Fourteen: fix tabs to spaces in two files. See #25946.
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Background Updates: Add a 'automatic_updates_complete' hook that fires after any updates have run. Props pento. Fixes #25841

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Avoid jshint errors in edit-comment.js.

props adamsilverstein.
fixes #25979.

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