have generic plotting functionality for loss and other metrics

[avinash2692]

Write a generic plotting function for visualizing training parameters. A few helpful links that this could be based on

• Javascript app from Practical pytorch repo : https://github.com/spro/sconce-python
• Tensorboard without tensorflow : https://github.com/torrvision/crayon or https://github.com/TeamHG-Memex/tensorboard_logger