Including pre-orders, Apple sold more than 13 million iPhone 6s and iPhone 6s Plus units last weekend, setting a new three-day sales record for the company. Apple CEO Tim Cook touted the new phones in a statement, saying “Customers’ feedback is incredible and they are loving 3D Touch and Live Photos, and we can’t wait to bring iPhone 6s and iPhone 6s Plus to customers in even more countries on October 9.” Apple will begin selling the…