MediaWiki 1.22/wmf15

The latest version (labeled "1.22wmf15") of MediaWiki, the software that powers Wikipedia and its sister sites, is being deployed to all Wikimedia sites in stages, starting on Thursday, 29 August 2013 (see the roadmap).

Important changes

 * Allow listing old files in Special:ListFiles. and add Special:[All]MyFiles as alias for Special:[All]MyUploads
 * Provide a JSON recent changes feed. https://gerrit.wikimedia.org/r/#/c/52922/
 * Multiple improvements to the new Gallery multimedia work
 * Core support for all of the HTTPS logic (geoip and preferences, specifically)