Add a scale function.
Add a scale function.

rrnewton/criterion,bos/criterion,paulolieuthier/criterion,bos/criterion,bos/criterion,iu-parfunc/criterion,osa1/criterion,osa1/criterion,iu-parfunc/criterion,paulolieuthier/criterion,bgamari/criterion,rrnewton/criterion,bgamari/criterion,iu-parfunc/criterion,rrnewton/criterion,paulolieuthier/criterion,bgamari/criterion