When is a company not a company? A modern-day Zen koan, maybe, but the evidence is all around us—Airbnb, Elance-oDesk, Handy, HourlyNerd, TaskRabbit, Uber. These businesses seem much more like conglomerations of independent professionals that connect to customers through a common platform, rather than traditional businesses that employ their workers. And so it seemed until June, when the California Labor Commission disrupted the sharing economy when it declared that an Uber driver was an employee,…