NPM artifacts generation

[brickpop]

Adding an artifacts package for NPM, including the ABI and deployed addresses

• Generates src/abi.ts importing the newly created JSON ABI files
• 65Kb compressed

npm warn publish npm auto-corrected some errors in your package.json when publishing.  Please run "npm pkg fix" to address these errors.
npm warn publish errors corrected:
npm warn publish "repository.url" was normalized to "git+https://github.com/aragon/osx.git"
npm notice
npm notice 📦  @aragon/[email protected]
npm notice Tarball Contents
npm notice 2.0kB README.md
npm notice 201.8kB dist/abi.d.ts
npm notice 304.9kB dist/abi.js
npm notice 75B dist/addresses.json
npm notice 92B dist/index.d.ts
npm notice 904B dist/index.js
npm notice 796B package.json
npm notice Tarball Details
npm notice name: @aragon/osx-artifacts
npm notice version: 1.4.0-rc0
npm notice filename: aragon-osx-artifacts-1.4.0-rc0.tgz
npm notice package size: 62.5 kB
npm notice unpacked size: 510.6 kB
npm notice shasum: 6b8c4921c5e324cac39135e391cb269a3ae01e7f
npm notice integrity: sha512-H3WFrcO18MIKl[...]R6zZos9IhqhUg==
npm notice total files: 7
npm notice
npm notice Publishing to https://registry.npmjs.org/ with tag latest and public access (dry-run)
+ @aragon/[email protected]