Updated mediawiki/extensions
Project: mediawiki/extensions/E3Experiments  d8acea6302a22fe723267d5e4ffb8dd50648d784

Housecleaning.

* Replace globRelative calls with hard-coded paths.
* Replace globals with context calls.
* Removed unused images.

Change-Id: Id49bbf565fd4ff59cbeeb9e16d3a7b0d10055cc2