A-B test for the Product options grid

Switch **A off** and **B on** by adding `class="u-is-hidden"` to the `<div id="forOptimizely-productOptionsA">`, and removing the same class from `<div id="forOptimizely-productOptionsB" class="u-is-hidden">`

# Test A

![screen shot 2014-12-11 at 14 55 23](https://cloud.githubusercontent.com/assets/2903904/5395961/cb87017c-8145-11e4-872b-ce6ab275e5cb.png)

# Test B

![screen shot 2014-12-11 at 14 55 00](https://cloud.githubusercontent.com/assets/2903904/5395962/d00a817e-8145-11e4-9ee7-a6ee56b49c15.png)
@samjewell Bit weird looking naming here, probs best to go less verbose and lose camel case - how about just `#products` and `#comparison`