Silence PHP warnings from disk_free_space(). disk_free_space() will produce a warning in error conditions in addition to returning false, this includes a case where the bytes free is greater than PHP_INT_MAX (which is a error condition we don't need to check).
See #25576, #22704

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Update the text for the about page, so translators can get started. Design is in flux.

props nacin, markjaquith, jorbin, jenmylo.
see #25603.

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Check if background core updates are supported on about.php.

see #25603, #22704.

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Remove redundant code. see #25603, #22704, [25833].

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In automatic background updates, standardize on 'update'.

New, final filter names:
 * auto_update_{$type} (plugin, theme, core, language)
 * automatic_updates_is_vcs_checkout
 * automatic_updates_disabled

New class name is WP_Automatic_Updater. Method names include update() and should_update().

see #22704.

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set_current_screen() is now unnecessary in Automatic_Upgrader_Skin, which is good because it breaks things in the network admin.

fixes #25622.

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Introduce email templates for automatic background updates.

The four templates are:
 1. We successfully updated their site. If any of their themes or plugins are out of date, it also mentions that. ('success')
 2. We are not configured to update their site, so we notify them of the new release. ('notify')
 3. We tried but failed to update their site. The error was early in the process, so no harm, no foul. This is the same as template #2, plus one sentence. ('fail')
 4. We tried to update their site, and failed while copying files. ('critical')

With assistance from markjaquith.

see #10787.

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Delete expired transients on database upgrades.

Reverts [25416], which had all transients being cleared. This leaves much to be desired, but we don't want a core update to be blamed for breaking a site that incorrectly assumes transients aren't transient.

props dartiss, pento.
fixes #20316.

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Awesome about page design for WordPress 3.7.

The page includes a giant password meter that serves as both an animated example and a working demo. How cool is that?

props jorbin, melchoyce.
see #25603.

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Remove rarr from about page text. Use a subtle background instead.

props markjaquith.
see #25603.

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