Twenty Fourteen: use numbered placeholders for Customizer help text in case they get swapped during translation, props obenland. See #25837.
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Merge the color schemes component from MP6. Introduces Light, Blue, and Midnight.

Color scheme selection on your own profile page gives you a preview and autosaves the selection.

Also introduces the usage of a preprocessor for core files, namely Sass. For 3.8, we will not expand its implementation past the color schemes. This does require Ruby as well as Sass 3.3.0+ due to the usage of the sourcemap option.

Note that only the default color scheme is available when running out of src. Use build to test the rest as well as the color picker.

props ryelle, melchoyce, tillkruess, drw158, littlethingsstudio, helen. see #25858, #22862.

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Inline documentation for hooks in wp-admin/includes/class-wp-comments-list-table.php.

props siobhyb, kpdesign.
fixes #25662.
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Turns out it helps if you add those pesky Sass files if you're going to use a preprocessor. see #25858.

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