Highchart renderer is a pure javascript renderer, the conversion
of the spec as clj-data to javascript is done in the render-js component

custom components need to define a javascript-module
module-test is a very simple sample that just renders the data as
JSON to the dom node that is passed.
In early state component development this is helpful.

 MathJax has v2 and v3. v3 is breaking the v2 api.
es6 modules for the browser not working; this means browser 
will load mathjax to window/MathJax
so we ship the compiled mathjax.js bundle

plugin to render vega-charts in pink-gorilla