Twenty Fourteen: add visual divider lines to child list items in widgets. Props iamtakashi, fixes #26415.
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Twenty Fourteen: minor code cleanup in Customizer file, props obenland. Fixes #26414.
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Remove the experimental RSS.JS feed, and move it to a plugin for feature development. Unprops pento. See #25639 

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Improvements to image quality handling in the image editor classes.

props markoheijnen, DH-Shredder.
fixes #25721.

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Twenty Fourteen: fix typo, props DrewAPicture. See #26414.
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