It’s been about three years since the president signed the Affordable Care Act into law. A series of new requirements have been introduced since then … and some of the biggest ones are right around the corner. Oct. 1, 2013 // Open Enrollment Begins in the Health Insurance Marketplaces Individuals and small businesses will be able to buy coverage through online, government-run marketplaces. Jan. 1, 2014 // The Big Day…