Retire priceAndBrand

WIP 

I'm seeing if I can do away without `priceAndBrand` because we can just set `price` and `brand` individually in the options (and the logic is easier in the internal templates, too). I tested the IAs that can get affected by this, and they're working pretty well:

Amazon:
![screen shot 2014-05-16 at 10 47 03 am](https://cloud.githubusercontent.com/assets/81969/2998507/869fff2a-dd0b-11e3-8f1b-c65a29840c3a.png)

Coupon Mountain:
![screen shot 2014-05-16 at 10 47 34 am](https://cloud.githubusercontent.com/assets/81969/2998508/86a02680-dd0b-11e3-8fde-5c9adb394773.png)

Congress:
![screen shot 2014-05-16 at 10 49 48 am](https://cloud.githubusercontent.com/assets/81969/2998509/86a060c8-dd0b-11e3-8da3-9346aa67fe6b.png)