Commit 603b7ec to master broke the library

[Taxuspt]

Commit https://github.com/mvexel/overpass-api-python-wrapper/commit/603b7ec1818befa780eb6f0389eb7b71db17dcfe which was merged to master has broken the library when dealing with geojson data. It makes the following, wrong assumptions:

• Ways and Relations contain a geometry field: That only happens if you call get() with verbosity='body geom'
• All the geometries inside a relation are closed polygons: That is only one of the options, as can be seen in the official documentation.

Please revert this commit. For proper parsing from OSM to GEOJSON you could use osm2geojson.

[mvexel]

We are doing this now (finally) with #140 merged. Once we get 0.7.1 out with this improvement I think this can be closed.