Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  8b3f8c26dbfa5a23d7141b713fcde193d610dd8c
null
update pre-commit hook to crush pngs

Keep Max happy by ensuring any pngs added to repository
are pngcrushed

Change-Id: I828d7954755f7bcf12f41d098f2714644f3362e5