Implemented seed argument for reproducibility (redo)

[nzrandol]

Hello! Thanks for this great tool! I figured I'd try my hand at contributing a little bit. I noticed this issue #5, and I decided to implement this.

The Details:

I added the new seed argument (and a comment explaining it) to base.yaml
seed will affect run_inference.py by being an argument for make_deterministic.

Please let me know if there is anything else I can do!