#11 Mixin solution for the issue

[scherler]

Creating a Mixin which allows to use React content in leaflet popups

[PaulLeCam]

Hi,
I think this kind of code should go in the application, not the library.

At this point I don't want to add specific handlers like createPopup() to be able to create a Popup, in my opinion it goes against the point of using React and simply having to include a component to render it.
I'll try to find a solution to render React components in Popups that doesn't involve new APIs.