Improve the description of the Network Admin Email option to better describe what the address will be used for. Fixes #23569 props nacin.

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westi forgot my full stop. see #23569.

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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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Twenty Fourteen: remove unneeded CSS rule, props iamtakashi. Closes #26418.
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Hook docs fixes following [26645].

See #25721.

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DFW: don't block the "keyup" event, fixes toggling the checkbox in the Link dialog with the spacebar. Fixes #25934.
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Two more hook docs fixes.

`image_memory_limit` filter:
* Go with int|string on the limit, and simply notate '256M' as an acceptable string value.

`wp_editor_set_quality` filter:
* Add a missing parameter description for the mime type.

See #25721.

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Widgets: on clicking Add, don't move the chooser out of the widget early as that makes is visible at the bottom of the screen. Remove the cloned copy of it instead. Part-props jeremyfelt, fixes #26417.
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Themes: When only one theme is available, show just the details view.

Only one theme may be available when no other themes are allowed (multisite), no other themes are installed, or when the user is denied the switch_themes capability but still has edit_theme_options.

props matveb, markjaquith.
see #25962.

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Twenty Fourteen: fix display of required comment field asterisk in comment instruction text. Props chellycat, fixes #26423.
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Twenty Fourteen: add author description below author name on author archive view, and update styles for archive header area. Props iamtakashi, closes #26420.
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Twenty Fourteen: avoid overflow for `audio` and similar elements. Fixes #26426.
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Restore CSS for the Site Content, née Right Now, Dashboard widget. Removes a nice large swath of unnecessary styles. fixes #26392, see #25824.

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Twenty Fourteen: change sort order on Contributor template to put author with mosts posts at the top. Props iamtakashi, closes #26427; see #24863.
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Create a new tag for themes that have passed the theme check guidelines for accessibility. Fixes #26157

Props lancewillett.


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Remove the shadow on the TinyMCE editor.

This removes it from distraction-free writing and also gives the editor a bit of a lighter feel.

fixes #26421.

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Themes: Disable collapse actions when showing only a single theme; improve the responsive layout.

props matveb.
fixes #25962.

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