Allow passing undefined to ol.layer.Vector#setStyle
Better docs for ol.layer.Vector#setStyle
Handle interfaces in the generate-externs task
Support nullable params and returns in generated externs
Merge pull request #2645 from ahocevar/nullable-externs

Support nullable params and returns in generated externs
Merge pull request #2638 from elemoine/setstyle

Allow passing undefined to ol.layer.Vector#setStyle
Merge pull request #2643 from ahocevar/interface-externs

Handle interfaces in the generate-externs task
Add @extends annotations to generated externs
Do not extend goog.* types
Walk up the inheritance chain to an exportable constructor
Add base classes to info.json and generated externs

This ensures that the inheritance chain is intact, even if the base
class is not exportable.