evt and bubble is optional
getCanvas, getHitCanvas and getContext is Layer methods right?
toDataURL don't need callback. It is sync function.
toImage don't return image - because async.
Container's `add` return this
find returns Collection
hasChildren returns Boolean
getPointerPosition return object
tween methods are chainable
Ellipse radius typo?
ring have no angle conf
Merge pull request #739 from lavrton/docImprove

Doc improve