Products are not returned with ROXML Version 3.1.2

[squeejee]

We upgraded from ROXML version 2.5.3 to 3.1.2 and products were no longer returned under categories.

>> s = Shoppr::Client.new(true)
=> #<Shoppr::Client:0x2b1cf531b9f0 @tracking_id="7000610", @sandboxed=true, @api_key="authorized-key">
>> s.search(:keyword=>"iphone").categories.first.products
=> []