capture_stones_with now returns an Array of captured stones
tests to make sure that it also works with multiple groups
KO works - or at least I think so :-) Also implemented copy_board
clarified error message for we should enver end up here in is_libery
corrected a bug where not copy_baord but copied_baord was called and removed TODO
Refactored is_forbidden_ko_move

* added is_same_move as API
removed helper form jasmine
Merge branch 'master' into travis_with_npm
too much whitespace and new build try