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Base classes for features that are backwards-incompatible.

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features = Features()
features.add(Feature("py3k_feature", "power< 'py3k' any* >", "2.7"))
PATTERN = features.PATTERN
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    A feature has a name, a pattern, and a minimum version of Python 2.x
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        Format the above text with the name and minimum version required.
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    A set of features that generates a pattern for the features it contains.
    This set will act like a mapping in that we map names to patterns.
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        Called every time we care about the mapping of names to features.
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        Uses the mapping of names to features to return a PATTERN suitable
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        Implement a simple mapping to get patterns from names.
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