Make $$() compatible with React.createElement.
Make $$() compatible with React.createElement.

This makes it possible to use JSX!
The babel transpiler plugin has an option to customize the name of the
function, i.e. to user $$() instead of React.createElement()

substance/substance,stencila/substance,podviaznikov/substance,michael/substance-1,michael/substance-1,podviaznikov/substance,andene/substance,andene/substance,substance/substance