Rename render/featuresoverlay files to featureoverlay
Rename ol.render.FeaturesOverlay to ol.FeatureOverlay
goog.require in alphabetical order
Variable renaming in examples
Use featureOverlay in select interaction
Change olx.render.FeaturesOverlayOptions to olx.FeatureOverlayOptions
Fix minor typo in vector-layer example
Add failing test for change event propagation
Make GeometryCollection dispatch `change` event'

When one of its component changes.
Merge pull request #1649 from tonio/geometrycollection_change

Make GeometryCollection propagate change events of its geometries.
Add projection option to ol.source.IGC
Add projection to igc example
Merge pull request #1656 from twpayne/fix-igc-projection

Fix projection in IGC example
Merge pull request #1638 from elemoine/featureoverlay

Rename ol.render.FeaturesOverlay to ol.FeatureOverlay
Dispatch 'render' event in renderer.canvas.VectorLayer

The context property of the event only contains the vector rendering.
Add ol.layer.Heatmap class and example