npm-health: Complete project health assessment of common JavaScript npm packages

[pombredanne]

We should run metrics analysis at some scale, by executing and fine-tuning the pipelines, metrics, models, and scoring on the select list of JavaScript packages from the npm ecosystem.

The outcome should be:

• npm-health: Select list of 1,000 JavaScript npm packages #875
• npm-health: Complete analysis of 1,000 JavaScript npm packages #876
• npm-health: Updated and fine-tuned data collection and metrics, based on this assessment #877
• npm-health: debugged and improved metrics collection pipeline #878
• npm-health: Project summary report and analysis report #879