Add ol.render.REPLAY_ORDER
Replay groups in defined order
Add ol.FeaturesOverlay#addFeature
Add ol.FeaturesOverlay#removeFeature
ol.FeaturesOverlay creates a features collection

ol.FeaturesOverlay creates an empty collection of features if the features option is not specified.
Merge pull request #1479 from twpayne/vector-api-draw-order

[vector-api] Draw vector features in the order polygons, lines, images
Use FeaturesOverlay in vector-layer example

This demonstrates how to use ol.FeaturesOverlay for feature highlighting.
Merge pull request #1480 from elemoine/vector-api-features-overlay

[vector-api] Add ol.FeaturesOverlay#addFeature and #removeFeature
Add anchorXUnits and anchorYUnits options to ol.style.Icon
Use anchorXUnits and anchorYUnits in icon example
Support anchorXUnits and anchorYUnits in KML format
Change default anchor for KML icons from Google Maps
Add typecast to icon example
Icon anchors are Array.<number>
Merge pull request #1483 from elemoine/vector-api-anchor-units

[vector-api] Support different anchor units in ol.style.Icon
Remove useless code
Export ol.format.KML#readName
Export ol.source.Vector#forEachFeatureInExtent
Scale the image size and anchor by pixelRatio
Merge pull request #1485 from elemoine/vector-api-exports

[vector-api] Export ol.format.KML#readName