CLEANING: remove *.pyc from the repository

You should add all *.pyc in .gitignore for two reasons:

1. they will be committed each time you run the code, that will make your repo quite big.
2. It pollutes the diffs of your commits, it become more difficult to see what you have changed from one commit to another.

Alike with the jupyter notebooks, before commit stop kernel and clean output. When you let the outputs inside you can not see the changes in the web interface.