Uncomment ol.render.canvas.Immediate#drawCircleGeometry
Merge pull request #1529 from fredj/vector-api-immediate-drawCircleGeometry

Uncomment ol.render.canvas.Immediate#drawCircleGeometry
Add export for ol.geom.LineString#getLength
Merge pull request #1532 from oterral/vector-api-exports

[vector-api] Add export for ol.geom.LineString#getLength
Merge pull request #1524 from oterral/vector-api

[vector-api] Add draw events
Finish polygon drawing on double click