Update jQuery UI to 1.11.1.

Because jQUI's build process no longer provides individual minified files we need some additional changes:
* Rename all files, remove the "jquery.ui." prefix. Add old files to `$_old_files`.
* Add and use non-minified files in /src.
* Add grunt task to minify jQuery UI files.
* (Non-minified files will not be shipped.)

Changelogs:
* http://jqueryui.com/changelog/1.11.0/
* http://jqueryui.com/changelog/1.11.1/

props Fab1en, ocean90.
fixes #29833.
Built from https://develop.svn.wordpress.org/trunk@29847


git-svn-id: http://core.svn.wordpress.org/trunk@29610 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Return the correct server response for the 'message' response field from the server.
Previously this would use the generic message corresponding to the response code, which isn't always accurate. Since we're already parsing the headers, we can simply return that directly (This also has the benefit that it's the same code for both Streams and Curl header handling).
Fixes #28919

Built from https://develop.svn.wordpress.org/trunk@29848


git-svn-id: http://core.svn.wordpress.org/trunk@29611 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Always cast the 'code' server response to an int, this provides consistency between both of the HTTP transports.
Previously cURL would return an int and Streams a numeric string.
Fixes #28887

Built from https://develop.svn.wordpress.org/trunk@29849


git-svn-id: http://core.svn.wordpress.org/trunk@29612 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correctly handle url's containing url's in WP_HTTP::make_absolute_url().
A valid relative URL could be mistaken for an absolute url if it contained a :// in any position of the url.
Fixes #28001

Built from https://develop.svn.wordpress.org/trunk@29850


git-svn-id: http://core.svn.wordpress.org/trunk@29613 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correctly support Schemeless URLs in WP_HTTP::make_absolute_url() by respecting the 'host' field if present in the relative url.
Fixes #29886

Built from https://develop.svn.wordpress.org/trunk@29851


git-svn-id: http://core.svn.wordpress.org/trunk@29614 1a063a9b-81f0-0310-95a4-ce76da25c4cd
When making a HTTP request to a non-standard port, include the port in the Host header for the Streams HTTP transport. This bring parity to the cURL transport and respects the HTTP RFC.
Props kamelkev for the initial patch; Fixes #28982

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git-svn-id: http://core.svn.wordpress.org/trunk@29615 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Avoid a PHP Notice when requesting a url without a path component (http://example.com) in the Streams HTTP component.
Props barrykooij for inital patch; Fixes #27668

Built from https://develop.svn.wordpress.org/trunk@29853


git-svn-id: http://core.svn.wordpress.org/trunk@29616 1a063a9b-81f0-0310-95a4-ce76da25c4cd
New `remove()` method and some unit tests for the `WP_Error` class.

props stephenharris.
fixes #28092.

Built from https://develop.svn.wordpress.org/trunk@29854


git-svn-id: http://core.svn.wordpress.org/trunk@29617 1a063a9b-81f0-0310-95a4-ce76da25c4cd