Good news for summer: Mazda is said to be working on a small roadster based on its home market Mazda2. Yes, they already make the Miata, one of the best sportscars ever made, but a new, small addition to the family could be fun as well.The Mazda2 is one of those Japan-only supermini cars that are Honda Fit-sized, and designed to offer as much practicality in as small a space as possible. Recently