* [react] Use HTMLDialogElement for the dialog node
* Actually add the `open` property
* This update requires typescript 2.6
* Update dependents of react to also require typescript 2.6
* Add typings for Reactable 0.14. Not complete but the stuff provided by the typings have been tested/used quite extensively by myself during the development of ReactPlayer!
* Add two tests (very simple one and a quite sophisticated one which contains all the components i created typings for...)