While many retailers are just getting serious about hiring of temporary employees for the holiday rush, expectation of stronger sales this year has been boosting the region's economy for several months.The distribution business both wholesale as well as the new Internet fulfillment centers that have landed in the region supercharge the importance of holiday employment in Reno, Sparks and Fernley.The warehouses that ship pallets of merchandise to fill the shelves of retailers in California and throughout the West stepped up their hiring several months ago as they began filling their racks, says John Parel, business services manager for Nevada JobConnect …