* ext/tk/lib/tk.rb, ext/tk/lib/tk/*.rb : replace obj.send() -> obj.__send__()
* ext/tk/lib/remote-tk.rb: add a new library which create an object to
                           control a Tk interpreter on the other process


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@6384 b2dd03c8-39d4-4d8f-98ff-823fe69b080e