Added a test for Cox Stratification
Finish output test for stratified cox
Fix input tests
Fix the data loading problem
Revert "Fix the data loading problem"

This bug is fixed in master branch. Remove these temporary fixes.
Added output tests for residuals
Finished residual tests
Finished normal output/input, strata output/input tests

Resid output tests are also done

Only thing that is left is Resid input tests

strata and normal input tests are together
Minor changes
Updates