[Parsetree] ruby_parser hacks StringIO

[Sven Fuchs]

I've finally come around to check this out. RubyParser overwrites  
quite some stuff in StringIO which breaks Rails (or is it Mongrel?).

Fixing this is quite easy: just don't monkeypatch StringIO directly  
but extend the class and use that one in RubyParser.

I've attached a patch that works for me.

Ryan, do you want me to file a bug somewhere? If so, where?

Would be awesome if you could apply this at some point.

Thanks :)

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