Change to use assert method.
Unsupported Regex in mrb_str_aref_m()
remove superclass test for classes that do not exist in mruby (core)
update String#slice doc
Merge branch 'suzukaze-delete-string.slice_comment'
Merge branch 'master' of github.com:mruby/mruby
resolve conflict
git push origin masterMerge branch 'yui-knk-replace-assert'