At this very same Frankfurt show two years ago, Lamborghini unveiled the Reventon — the Raging Bull’s stunning, range-topping super model. With all 20 copies of the Reventon gone and the Murcielego nearing the end of its long lifespan, Sant A’gata Bolognese has one more trick behind the curtain in the form of the Reventon Roadster. In all, the Reventon Roadster is essentially a Reventon with