* ext/readline/readline.c (readline_s_set_input): new method.
* ext/readline/readline.c (readline_s_set_output): new method.
* lib/irb/input-method.rb: set Readline.input and Readline.output.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8638 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* ext/readline/extconf.rb: added new option --enable-libedit.
* test/readline/test_readline.rb: added assertions for
Readline::HISTORY.
* lib/irb/input-method.rb: do not use Readline::HISTORY.pop.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@8489 b2dd03c8-39d4-4d8f-98ff-823fe69b080e