Update the wp-inclues/vars.php file header to include Nginx as a recognized web server.

Props netweb for the initial patch. Props markjaquith.
Fixes #26249.

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Avoid a fatal error in wp_reset_postdata() if $wp_query global is not set.

see #26775 for trunk.
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Deprecate rich_edit_exists(). It doesn't make sense to support deleting the TinyMCE directory when we have auto-updates. Fixes #26786.
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TinyMCE: re-enable soft resizing of images inside the editor. See #24067.
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Fix alignment and borders of plugin/theme updates on the Updates screen.

props morganestes, ocean90.
see #26699, for trunk.

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