GeoJSON stuff ?

[cyrilchapon]

How about a release accepting any geojson data ?
Appart from the QuadTree stuff, it would be very great, since no viable libraries can be found to display a simple mask overlay (the only trick is to invert a polygon, and set it on a top pane)

[domoritz]

I won't have the time to write this but I'm happy to review a pull request.