CrunchBoxes allows you to share data with the world in a simple, easy to embed format. However, not all datasets naturally translate to the CrunchBox format. This function checks your dataset to see if it has variable & category definitions that will work well with the CrunchBox format.
preCrunchBoxCheck(dataset)CrunchDataset, potentially subsetted on variables
Invisibly, the dataset. Called for side-effect of printing things.