code: public void addEmitter(ConfigurableEmitter emitter) {
  		emitters.add(emitter);
  
  		if (system == null) {
  			waiting.add(emitter);
  		} else {
  			system.addEmitter(emitter);
  		}
  	}
docs: Add an emitter to the particle system held here
  
  @param emitter
  The emitter to add