Maybe the event name could be removed_from_scene instead...

Object3D now dispatching added/removed events when object is removed from it's parent. CSS3D can nore auto-remove DOM elements. See #3575.

Camera matrix was being updated after the style was get for the camera element, needs to be done before else it lags a frame behind.

This was causing vortex-looking bug when panning camera with TrackballControls on right click drag.

Not ideal because our object.lookAt flips orientation.

However, it's not handling object removal yet. But I think I've an idea to handle all this stuff nicely...