Combine orange zest, orange juice and vegetable oil, set aside. Bring the water to a rolling boil, remove from heat, stir in the couscous and cover. Let stand for 5 minutes. Remove lid and fluff with a fork. Spoon couscous into a serving bowl. Add the chickpeas, scallions, parsley and dried cranberries. Drizzle over the dressing and toss. Cover and refrigerate until serving. Top with crumbled feta cheese prior to serving.