Add an API to JSX Loader #16

Hello!

What an incredible product you have here.
I know forms are a pain to produce, and this will help.

What caught my eye more than anything is the jsxLoader.

I really like it and would love to use it to make react-styleguidist faster.

• Do you think it could be made into a separate npm package?
• Do you think one could ask for a specific pragma to package the jsx?
  • for mercurial it's mercurial.h, for vue simply h
• Most importantly, do you think that this transformation could be done without running the code?

I was thinking of an api like this

import { transform } from '@dataformjs/jsx-loader'

const desugarizedCode = transform('<Comp>hello mama</Comp>', {pragma: 'h'})
console.log(desugarizedCode)
// "h(Comp, , ['hello mama'])"