code: public ChainedTransformation addTransformations(Transformation<?, ?>... transformations)
  	{
  		duration = 0;
  		for (Transformation<?, ?> transformation : transformations)
  		{
  			duration += transformation.totalDuration();
  			listTransformations.add(transformation);
  		}
  
  		return this;
  	}
docs: Adds the {@link Transformation} this to {@link ParallelTransformation}
  
  @param transformations the transformations
  @return the chained transformation