function InteractiveController(o)
{
	this.enabled = true;
	this.mode = InteractiveController.PICKING;
	this.layers = 3;

	this._last_collision = null;

	if(o)
		this.configure(o);
}
Allows to easily test interaction between the user and the scene, attach the InteractiveController to the root and the mouse down,move and up events will
be processed using a raycast and trigger events.
@namespace LS
@class InteractiveController
@constructor
@param {Object} last serialized data [optional]