Caterpillar Inc. CAT, -1.06% reported Friday August machine retail sales that showed further deceleration in growth worldwide, despite continued acceleration in North America. The stock slipped 0.1% in morning trade. On a 3-month rolling basis, total machines sales globally rose 23% in August, after rising 24% in July and 25% in June. In North America, however, sales rose 29% in August, after increasing 27% in July and 22% in June. Sales in the resource industries…