TST: Add test to verify that new stratified_two_sample gives the same results as stratified_permutationtest when called on two samples.
TST: Add test to verify that new stratified_two_sample gives the same results as stratified_permutationtest when called on two samples.

kellieotto/permute,qqqube/permute,kellieotto/permute,jarrodmillman/permute,statlab/permute