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Closes #121, alternative to #129.
This is slightly less efficient than the approach in #129, because the file is re-read and re-written, but it doesn't involve monkeypatching anything, so it's more robust. Given that the parsing and refactoring machinery is already an order of magnitude slower than reading/writing files, I think the more robust approach is preferable.
This uses a subclass of StdoutRefactoringTool. If the line endings were specified, after a file is written by 2to3, we immediately read it again and rewrite it with the specified newlines.