Support 'Style by CSS' functionality

@kirjs Currently in react-highcharts the only way to style is through the highcharts API. It would be extremely helpful to incorporate Style by CSS.

jsbin showing it is not supported: http://jsbin.com/fahexih/edit?html,css,js,output

documentation on ‘new’ style by css functionality: http://www.highcharts.com/docs/chart-design-and-style/style-by-css

Could be done via a prop such as styleByCss

<ReactHighstock config={myConfig)} styleByCss={true} />

[Jakehp]

Workaround - import the Style By Css version of the lib, and pass to react-highcharts. Maybe it’s not in react-highcharts scope to determine this?

import highcharts from 'highcharts/js/highcharts'; // import style by css highcharts
const ReactHighstock = require('react-highcharts').withHighcharts(highcharts);

[kirjs]

I’m traveling ATM and won’t be able to implement, but happy to merge a PR