Is there a way to take our tune_results object and coerce it into the right format to use here?

[edgararuiz]

    Is there a way to take our `tune_results` object and coerce it into the right format to use here? 

In the tune_results structure, the data object in the elements of splits are the training data and these new validate functions requires the predictors to be there.

We should talk about this in the Details section (that they are not the same) and maybe have a helper function to convert the original results to something that cal_validate_ * can consume.

I don't see a simple way to keep the same resampling structure as the original tune_results object.

Originally posted by @topepo in #63 (comment)