Move `toolbar` declaration after the `:visible` check, like it was before [28019].

props kovshenin.
fixes #24859.
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Theme Installer: Prevent default events for "Upload Theme" and "Browse" buttons.

see #27055.
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Restore `GalleryAdd()` and `GalleryEdit()` in `media-views.js` to ensure back-compat.

See [27362].


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Theme installer keyboard fixes. Updates [28033] and [28036].

props matveb.
see #27521.

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Escape playlist data in templates.

props wonderboymusic.
fixes #27710.

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Don't show featured images for image attachments. Remove abstractions for now.

fixes #27673.

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3.9 about page text, rough cut.

props markjaquith, nacin.
see #27713.

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Harden HMAC verification. props duck_.

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3.9-RC1

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TinyMCE: make sure vertical resizing and menubar show/hide are set to default for each instance, fixes #27724
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Fix TinyMCE Views in IE8 and 7:
- Add fallback background images for dashicons.
- Fix hiding the clipboard while still allowing the contents to be selected.
- Work around lack of border-box in gallery styles.
(Includes precommit cleanup for theme.js)
Props gcorne, fixes 27546
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