Updated mediawiki/skins
Project: mediawiki/skins/BlueSky  3d2586cda76920553be34bd8c1b7db7f08326a13

Support for a custom logo ([[File:BlueSky-logo.png]]).

The sitename, rendered as an <h2> element, is used as a fallback in the
absence of a custom logo.

Change-Id: Icb860c5e91414d884040799b67be8836b0409ce2