Python release tool

[nirizr]

Make releasing easy:

• [x] Sanity-checks
  • checkout is clean
  • branch is master
  • branch is in sync with origin
• [x] build packages
• [ ] bump versions
• [ ] Auto-generate a changelog
• [ ] Create release tag and commit to master
• [x] submit to pypi
• [ ] Make a github release and upload packages
• [ ] Configure Docker to create builds based on tag

Replaces #402