added jshint to grunt test task
added jshint to grunt test task

apercas/gfw,Vizzuality/gfw,codeminery/gfw,KarlaRenschler/gfw,KarlaRenschler/gfw,codeminery/gfw,KarlaRenschler/gfw,cciciarelli8/gfw,apercas/gfw,apercas/gfw,codeminery/gfw,apercas/gfw,codeminery/gfw,KarlaRenschler/gfw,cciciarelli8/gfw,Vizzuality/gfw