Update grunt-banana-checker to 0.4.0
Update grunt-jsonlint to 1.0.6
Update grunt-jscs to 2.5.0
Also support looking into sub folders for jshint and jscs.
Also fix some js code so
Replace
} ) ( mw, jQuery );
with
}( mediaWiki, jQuery ) );
Also remove a blank message that should not be there in gu.json
Also remove two blank messages in tl.json.
Change-Id: Ib8390de6fd6adfc4a9ad22c48c7872aac332d4ae