npm-health: Package, document, and deploy

[pombredanne]

To nicely wrap up the npm-health project, we should also consider a proper documention, demo system and packaging for deployment

• Documentation: npm-health: Usage documentation, to make the integration practical for downstream users #874
• Deployment: npm-health: Deployed eval/demo system #873
• Packaging: npm-health: Packaged release with installation documentation for deployment #872