Factor out ol.geom.SimpleGeometry
Add ol.geom.Geometry#clone
Implement clone for simple geometries
Add ol.geom.GeometryCollection
Add ol.geom.GeometryCollection rendering
Add ol.geom.GeometryCollection support to ol.format.GeoJSON
Don't use postcompose in geojson example
Add GeometryCollection to geojson example
Add deep clone test
Merge pull request #1358 from twpayne/vector-api-geometry-collection

[vector-api] Add ol.geom.GeometryCollection