Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  59fd76ed753b1c875f81ac96bbf1888d7ebea330

Hygiene: Lint the cucumber tests

Ensure all rules are defined and that unused ones are removed
Add handy script for checking this in future
Kill NonExistentPage in favour of ArticlePage

Change-Id: I0df4a8ad186daac92ec9de482a55428e09cca6a6