Release tooling / documentation

[ryan-roemer]

• [x] Add documentation in CONTRIBUTING.md or README.md as appropriate for all steps. Make sure to document that we require an npm version workflow.
• [x] Change existing package.json:lint task to be `package.json:lint-fix
• [x] Create a non --fix script task package.json:lint
• [x] Add package.json:preversion task that does npm run lint
• [x] Add package.json:clean-build task that does rimraf lib
• [x] Add package.json:version task that does npm run clean-build && npm run build && npm run umd