Add sequential2graph.py script
Add sequential2graph.py script

This script converts the sequential json models (read by
LightweightNeuralNetwork) into graph models (read by
LightweightGraph). In the future we'd like to move toward supporting
primarily the graph models.

jwsmithers/lwtnn,jwsmithers/lwtnn,jwsmithers/lwtnn,lwtnn/lwtnn,lwtnn/lwtnn,lwtnn/lwtnn