Updated mediawiki/extensions
Project: mediawiki/extensions/ZeroRatedMobileAccess  888c4225e65d768b0200cb9d12ee9cf311597f80

Migrated to single page config

* All settings are loaded from the common JSON page
* Config data is validated and cached
* Removed lots of legacy code to load and parse config pages
* Added sample json configuration page

Change-Id: Ie61a3675ec6185cfecd5ff3468069977ebe95a33