Add ol.geom.Polygon#getLinearRingCount function
Document ol.geom.Polygon#getLinearRing function
ol.layer.Vector.getSource return type specialisation.
Remove unnecessary type cast
Merge pull request #2651 from gberaudo/layer_vector_source_specialisation

ol.layer.Vector.getSource return type specialisation.
Add olx.layer.ImageOptions typedef
Set ol.layer.Image#getSource return type to ol.source.Image
Remove unnecessary type cast
Set ol.layer.Tile#getSource return type to ol.source.Tile
Remove unnecessary type cast
Merge pull request #2656 from fredj/image-layer-source-type

Set ol.layer.Image#getSource return type to ol.source.Image
Use the feature style if defined

Same behavior as ol.layer.Vector
Use a custom style for the position feature
Merge pull request #2676 from fredj/featureoverlay-style

ol.FeatureOverlay: use the feature style if defined
Add TextStyle offsets getters to API.

The other properties getters are in the API already.
Merge pull request #2677 from gberaudo/export_text_style_offsets

Add TextStyle offsets getters to API.
Merge pull request #2534 from fredj/polygon-api

Document ol.geom.Polygon#getLinearRing function
Make tileSize a config option for ol.source.XYZ
Merge pull request #2681 from ahocevar/xyz-tilesize

Make tileSize a config option for ol.source.XYZ
Use ol.LEGACY_IE_SUPPORT and ol.IS_LEGACY_IE define

See #1605