npm publish

• Update package.json, set version to a prerelease version, e.g. 2.0.0-rc1, 3.1.5-rc4, ...
• Run npm packto create package
• Run npm publish <packagename>.tgz --tag next to publish the package under the next tag. (if can't publish first time, use npm publish --access=public)
• Run npm install --save package@next to install prerelease package