Node.js library to easily embed vega views

 node-vega-embed makes it easy to embed interactive node-vega and
 node-vega-lite views into web pages. With node-vega-embed, it is possible
 to:
  * Load Vega/Vega-Lite specs from source text, parsed JSON, or URLs
  * Patch Vega specsto add additional functionality
 * Add action links such as "View Source" and "Open in Vega Editor"
 * Include Vega Tooltip