Fix docs for the `deactivate_$plugin` and `deactivated_plugin` hooks.

Props wpsmith for the original patch.
Fixes #27189

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wpLink: stop using UI dialog, restyle the modal, add better responsive behaviour.
Fix UI dialog styling to match the rest of the admin styling.
Props avryl, see #26952
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wpLink: set max-height to 500px (like before) and vertically center the modal (except in IE8), see #26952
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git-svn-id: http://core.svn.wordpress.org/trunk@27337 1a063a9b-81f0-0310-95a4-ce76da25c4cd
wpLink: better structural and responsive styles, see #26952
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Add header image uploads with cropping to the customizer.

props mcsf, ehg, gcorne.
see #21785.

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JS linting for [27497].

see #21785.

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Bring the theme browsing experience from 3.8 to the theme installer. First pass.

props matveb with assists from me and gcorne.
see #27055.

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A nice round commit number for a beta 1.

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