WP_HTTP: Replacing the Fsockopen & Streams Transports with a new Streams transport which fully supports HTTPS communication.
This changeset also bundles ca-bundle.crt from the Mozilla project to allow for us to verify SSL certificates on hosts which have an incomplete, outdated, or invalid local SSL configuration.
Props rmccue for major assistance getting this this far. See #25007 for discussion, also Fixes #16606 

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git-svn-id: http://core.svn.wordpress.org/trunk@25194 1a063a9b-81f0-0310-95a4-ce76da25c4cd
WP_HTTP: Re-enable curl, it was accidentally left out of [25224]. See #25007 See #16606 

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git-svn-id: http://core.svn.wordpress.org/trunk@25195 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid 'Only variables should be passed by reference' notice on Widgets screen. props jdgrimes. fixes #25225.
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git-svn-id: http://core.svn.wordpress.org/trunk@25196 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Upgrader: Split the UI "skins" out from the main Upgrader file into a seperate file to reduce the length of the files. See #22704

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git-svn-id: http://core.svn.wordpress.org/trunk@25197 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Core Auto Updates: Add a initial skin to allow capturing the output from the upgrader without displaying it (such as we need during cron calls).
This has been copied almost verbatim from the automatic-updater plugin with a few style tweaks and additional upgrade-possible check. See #22704

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git-svn-id: http://core.svn.wordpress.org/trunk@25198 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Update phpdoc for get_current_site(). props jeremyfelt. fixes #25040.
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git-svn-id: http://core.svn.wordpress.org/trunk@25199 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Add phpdoc for 'wp_redirect' and 'wp_redirect_status' filters. props DrewAPicture. fixes #25215.
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git-svn-id: http://core.svn.wordpress.org/trunk@25200 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Move check_password_reset_key(), reset_password(), and register_new_user() from wp-login.php to wp-includes/user.php, to make them reusable. props beaulebens for initial patch. fixes #20279.
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git-svn-id: http://core.svn.wordpress.org/trunk@25201 1a063a9b-81f0-0310-95a4-ce76da25c4cd