* Mark transpiled JSX elements as pure
* Avoid duble annotation
* Add "pure" option to the React preset
* Fix generator indentation
* Update tests
* Add tests for the "pure" option
* Update windows fixtures
* Bail out on JSX fragments instead of throwing
The `transform-react-inline-elements` plugin doesn't handle JSX fragments. It throws an exception because `node.openingElement` is undefined.
* Add a comment explaining `node.openingElement`