I want to commit this patch to emacs-24. Is that okay?

The change is not particularly useful by itself, it changes 
`ruby-beginning-of-block' and `ruby-backward-sexp' behavior (making 
things more complicated for third-party code), and, while fixing the 
round-trip problem (*) for "something do\nend", introduces it for "def 
foo\nend".

(*) When the point is at the end of block, we want (progn 
(ruby-beginning-of-block) (ruby-end-of-block)) to bring us back to where 
we were at the start.