Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  5a737cc13cdb15f8f12a04ff688efeccc8342871

Stop people from checking in the locked Gemfile

This stops me from being able to run
make cucumber

Removing this from repository ensures it works!

Change-Id: I39d45b2416c43c027ee0735fc0d2d12ca6d635e4