Also eliminate some duplicate code introduced into SpecialPage::headElement() in r61071 by calling Skin::getPageClasses() instead, and use $sk parameter instead of $wgUser->getSkin() to get skin name.
* replaced calls to Article::getLatest() by Title::getLatestRevID()
* introduced Skin::isRevisionCurrent()
* made checks on Skin::pageStats() more coherent
A "Relevant" is used by the skin to determine what title to display tabs for. This setting allows pages like Special:MovePage (which is linked to from the tabs themselves) to retain the tabs specific to the page relevant to it when switching to the special page.
Similaly a "Relevant" user is used by the skin to display things in the toolbox which would usually only be displayed on the user's userpage and talkpage, pages like Special:Contributions which are linked to by the toolbox can use this to retain the toolbox links when switching between the user pages and these special pages.
Under current behavior for "MonoBook" the skin loader will load "SkinMonobook" instead of "SkinMonoBook". Because the skin system loads from skins/ when it can't find a skin and php's class system is case insensitive by a fluke MonoBook has been fine despite the skin loader trying to load SkinMonobook despite the class being named SkinMonoBook.
However our autoloader is case-sensitive, and as a result if you try to name your extension based skin class something like SkinStereoBook the skin will break with a cryptic error message because the skin loader attempts to load SkinStereobook, doesn't find it in the autoloader, then throws a php error when it tries to load skins/StereoBook.php and can't find the file.
We have also been using the $skinName to generate the name of the file to load from skins/ so this value is already expected to be safe for use in this way.
2. Add more Accept-Language XVO cache name for IE;
3. Use hreflang to specify canonical and alternate links, it's search engine friendly
when a wiki has multiple variant languages.
* Added $wgResourceLoaderInlinePrivateModules to allow private modules to be either embedded in the HTML output or accessed through ResourceLoader (which will bypass squid cache and check the user paramter against $wgUser)
* Moved more generated javascript functionality to ResourceLoader
* Fixed comment typo made in r73673
* Added documentation for ResoruceLoaderRegisterModules hook
* Renamed user.preferences to user.options
* Fixed bug that caused anonomous usernames (such as IP addresses) to be used in user style and script requests
* Fixed user options styles not loading for anon users
