removes the magic comment for ruby mode

remove_magic_comment.diff

diff --git a/ruby-mode/ruby-mode.el b/ruby-mode/ruby-mode.el
index 94cb9ab..d810146 100644
--- a/ruby-mode/ruby-mode.el
+++ b/ruby-mode/ruby-mode.el
@@ -350,7 +350,7 @@ Also ignores spaces after parenthesis when 'space."
                               ((forward-char)))))
                  (insert coding-system)))
               ((looking-at "\\s *#.*coding\\s *[:=]"))
-              (t (insert "# -*- coding: " coding-system " -*-\n"))
+              (t (insert ""))
               )))))