New release with Traffic datasets

• Traffic datasets from new papers are added

Corrected T-GCN

• T-GCN correction.

Added T-GCN

• Added the Temporal GCN model.

Hidden state fix.

Fixed the hidden state and cell state device transfers.

Added STGCN

• STGCN release.

Dynamic graph discrete signal iterator

• Added the dynamic graph discrete signal iterator

DCRNN

• DCRNN Implementation by Paul Scherer

Discrete data iterator with static graph and split.

• Discrete iterator with static graph.
• Added the splitting function.
• Chickenpox dataset release.

Added Evolve GCN variants

• Evolve GCN variants are added.
• Installation description.

DyGRAE

• Added the DyGrAE model
• Fixed the README