Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  7620f612232b8aea4f8cf38ff2b066c459237ac3

Add qunit and file watching support with grunt

New tasks added:
* grunt qunit (runs tests)
* grunt watch (watches js files, when changed auto runs linters and tests
* grunt test (now runs tests also)
* grunt ((default) refers to the test objective for the moment)

Change-Id: I11f3c41973621b9cf3132908a4cf24fca17d9690