issue#555 move kwargs to separate parameter

I ran only unittest iota2.tests.integrationtests.iota2_tests_running_classification.iota_tests_runs_case.test_s2_scikit_learn which is successful:

----------------------------------------------------------------------
Ran 1 test in 335.062s

OK

I added in commit 2b73058d utils function that I'm going to use in my regression builder.