Updated mediawiki/skins
Project: mediawiki/skins/chameleon  e5637804235ddb329480419e9783ec07b5fbd677

More style fixes

* specify exact relative paths to import files into core.less
* add styling for printfooter and section edit links
* tweak thumbnails
* add utility classes: center, floatleft, floatright

Change-Id: I49925d705495cc643efa9df2da03ce3ab56fc296