Add support for regression bootstrapping
Add support for regression bootstrapping

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