Update to MediaWiki 1.25.4

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+MediaWiki-Core-Vendor
+=====================
+
+[Composer] managed libraries required or recommended for use with [MediaWiki].
+This repository is maintained for use on the Wikimedia Foundation production
+and testing clusters, but may be useful for anyone wishing to avoid directly
+managing MediaWiki dependencies with Composer.
+
+
+Usage
+-----
+
+Checkout this library into $IP/vendor using `git clone <URL>` or add the
+repository as a git submodule using `git submodule add <URL> vendor` followed
+by `git submodule update --init`.
+
+
+Adding or updating libraries
+----------------------------
+
+1. Edit the composer.json file
+2. Run `composer update` to download files and update the autoloader files.
+3. Add and commit changes as a gerrit patch.
+4. Review and merge changes.
+
+
+[Composer]: https://getcomposer.org/
+[MediaWiki]: https://www.mediawiki.org/wiki/MediaWiki