[Ironruby-core] [patch] downto/upto

[Jb Evain]

Hey,

In the process of running one of my script on IronRuby I needed upto,
so here it is, along with his downto friend.

I was wondering if I could simply call Step with the relevant limit
and step from upto/downto, but wasn't sure that was correct.

I've basically monkey saw, monkey did the whole thing, please correct
me if I got some parts wrong.

-- 
Jb Evain  <jb at nurv.fr>
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