Starbucks is now allowing people to use its restrooms and sit in its cafes and patios even if they do not buy anything.The coffee giant on Saturday announced its new policy, which says that customers, including those who did not make a purchase, can come to its cafes and stay — as long as they behave properly.The announcement comes about five weeks after a manager at a Philadelphia Starbucks called the police on two young black men who had arrived at the coffee shop early for a business meeting.