integration with Flux

It would be helpful to add to the documentation an example of integration of DataAugmentation.jl in a pure Flux pipeline,
e.g. https://github.com/FluxML/model-zoo/blob/master/vision/vgg_cifar10/vgg_cifar10.jl

An alternative is to modify the model zoo example by adding data augmentation, which is quite standard on CIFAR10. If could do that if you can provide some indirections.