add model visualization

[barrybecker4]

Add Model visualization (supported in b6 of dl4j) to help with finding better hyper-parameters in order to tune better.
See https://deeplearning4j.konduit.ai/tuning-and-training/visualization

[barrybecker4]

This may need to wait until beta7
I tried with beta6, and I can see the web UI, but it does not seem to populate with any data while the training is running. Pretty sure I did everything right to hook it up.