Add Car Rental Widget from Landing Pages

![1414683210](https://cloud.githubusercontent.com/assets/708296/4846205/2c1b5582-604a-11e4-80ab-fec7b79cb81e.png)

It unfortunately is: https://github.com/lonelyplanet/rizzo/blob/remy-car_rental/app/views/components/widgets/_car_rental.html.haml#L36