Model parameter versioning

[phil8192]

• Currently learned model weights are stored in a HDF5 file.
• The network topology and weights should be stored in such as way that makes model comparison and later model aggregation easy.

1. Store network topology as JSON on Github.
2. Store network meta data + learning parameters as JSON on Github.
3. Store learned model weights on Github using Git LFS. The weights should be in HDF5 format.