Register devel/py-six as dependency
- Make Grammar iteration ordered, making the __repr__ more like the
original input. (Lucas Wiman)
- Improve text representation and error messages for anonymous
subexpressions. (Lucas Wiman)
- Expose BadGrammar and VisitationError as top-level imports.
- No longer crash when you try to compare a Node to an instance of a
different class. (Esben Sonne)
- Pin six at 1.9.0 to ensure we have python_2_unicode_compatible.
(Sam Raker)
- Drop Python 2.6 support.
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