Infinity

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- Removed py27, py33 support

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- Added __hash__ method

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- Made __eq__ return True for inf == float('inf') and -inf == float('-inf')

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- Added support for __rdiv__, __radd__, __rsub__ and __rmul__ operators
- Added is_infinite utility function
- Added __repr__

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- Added __rpow__ implementation for infinity

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- Initial public release