Feature apidoc, fix events and observable properties

[tchandelle]

id and style are not observable, and so, don't trigger change:id and change:style events, but just a change event

[ahocevar]

Interesting. It looks like geometry is also not observable.

[tchandelle]

geometry is observable, but only when geometryName is 'geometry'. This may need some clarification.

[ahocevar]

Ah, I see now that setGeometryName() updates the object listener for the geometry name. So the geometry is observable, regardless of the geometryName.

[fredj]

Thanks