Add export for ol.geom.LineString#getLength
Add draw interaction events
Add tests for draw interaction events
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
Add new 'accuracyGeometry' property to ol.Geolocation