[grammarians] Comparison to RubyFront grammar

[Xue Yong Zhi]

>Well, RubyFront would certainly be a good basis, but as far as I know
>(Xue Yong Zhi, please correct me if I'm wrong), RubyFront is just a
>component of the XRuby project.
>

Well, it does not have to be. Actually my original plan was to make 
rubyfront a standalone project. But since nobody really showed interest in 
using it, I just merge it into the XRuby's repository for my own 
convenience. A slightly older version is still available to download as a 
standalone project at: http://xruby.com/Documents/rubyfront.zip . To used 
the newer one, just grab anything from 
http://xruby.googlecode.com/svn/trunk/src/com/xruby/compiler/parser/ (you 
may not want ruby.tree.g, which is incomplete and coupled with codegen 
backend)

As I said, anyone is welcome to use/change/fork the code -- it is BSD 
license.

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