Updated mediawiki/extensions
Project: mediawiki/extensions/GettingStarted  8155aa99b0f4f0e0aab542a277dc72490a03f330

Render the lightbulb icon correctly in IE8

Resize the lightbulb PNG to 13px square as IE8 doesn't support the
background-size CSS property.

Change-Id: I3b84009fe105166232e876c8de5a252c3dcb2fba