Should GeoVector have a method to convert to/from a GeoJSON string?

[astrojuanlu]

It's very tempting to do

from shapely.geometry import mapping

str(mapping(gv))  # Wrong!

but this won't work because of https://gist.github.com/sgillies/2217756#gistcomment-1397048. Instead, the correct code is

import geojson

geojson.dumps(gv)  # Correct!

It's a very simple function call, but we still could add it as a method.

[guydou]

I think that we don't need to add a method, otherwise we will need to add method to serialize gv to many formats, no?