'\0' character.
(relative_path_from): new method.
(each_entry): new method for replacement of dir_foreach.
(foreach, foreachline, dir_foreach, chdir): obsoleted.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4671 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
(to_s): return duplicated string.
(children): new method.
(each_line): new alias to foreachline.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4662 b2dd03c8-39d4-4d8f-98ff-823fe69b080e