Decouple Build Process from PyPI

[jjacobson95]

The build_all.py script currently includes:

• building all datasets
• pushing to Figshare
• pushing to GitHub
• pushing to PyPI

We want to decouple the PyPI build and have the ability to run this separately.

[ymahlich]

It would be good to get a list of "interaction" points where the package relies on data that has been generated during the dataset build process (e.g. the figshare link).

We might want to have a "central" yaml or config file that contains all the information that is changed from version to version respectively the "hard coded" data that can change between build processes.

[jjacobson95]

The only interaction points are the figshare link, version/tag number (previously), and scripts/push_to_pypi.py (also no longer needed, but take a look).

I think the central yaml is a good idea. Want to create an issue for that separately?