Pypi fixes

[rstoneback]

Description

Addresses #50

Adds pyproject.toml file to deal with potential lack of numpy on a user's system. Includes small fixes found when releasing v1.0 to pypi.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Don't have a known way to test without releasing. Dealing with a build on a server that downloads released packages.

Checklist:

• Make sure you are merging into the develop (not master) branch
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• Add a note to CHANGELOG.md, summarizing the changes