Resume recs addition

this adds the ability to call for resume recs through the api gem.  This requires an OAuth token which is usually generated through Services::OAuth in Consumer domain, but you can do this using any OAuth client including the CB 3scale ruby gem.
Instead of making this a model, inherit from `ApiResponse` and stick it in the Cb::Responses namespace. The `ApiResponseModel` parent class doesn't handle metadata creation. Also `ApiResponse` provides methods for accessing the model array, i.e. `response.models` and `response.model` - both return whatever is created in the `#extract_models` method that you're forced to override when you inherit.