Updated mediawiki/extensions
Project: mediawiki/extensions/VisualEditor  65ac18229a7367ecf2aadd9831c1bf56deeec505

Remove unused .csslintignore

This file was for the Jenkins job of csslint (since it doesn't
use the Gruntfile), now that it does, this file is redundant.

See also 94b213bd1ec33a2 in oojs-ui.

Change-Id: I62c2eb9cf62ebb15a19158f4913bf8a18597c7d4