init script

[mbostock]

• [ ] Verifies .gitignore.
• [ ] Verifies .npmignore.
• [ ] Verifies README.md; if missing, creates example README.
• [ ] Verifies index.js; if missing, creates example export.
• [ ] Verifies src/ directory; if missing, creates example export.
• [ ] Verifies test/ directory; if missing, creates example test.
• [ ] Verifies package.json; creates empty package.json if missing.
• [ ] Verifies package.json name; uses local directory name if missing.
• [ ] Verifies package.json keywords; adds d3 and d3-module.
• [ ] Verifies package.json main.
• [ ] Verifies package.json module.
• [ ] Verifies package.json scripts.
• [ ] Verifies package.json devDependencies.

mkdir d3-foo
cd d3-foo
npm install d3-scripts
node_modules/.bin/d3-init