The first Audi Quattro rolled off the assembly line 30 years ago. Since then, all-wheel drive has been a key feature of the carmaker's fleet, whether in sporty coupés like the RS 5 or sedans like the recently introduced A7.Now Audi wants to offer an all-wheel drive version of the supermini A1, which is still a concept vehicle. We had the opportunity to test the tiny car in Canada. The A1 Quattro prototype had no trouble mastering the icy curves. It's set to be launched in 2013.