Rockefeller

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- Fixing repo url in setup.py

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- Updating README to point to new repo url

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- Python 3.3 compatibility
- Continuous integration with Tox
- Money object support for divmod built-in function
- New money property: rounded_amount and rockefeller.round_amount function

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- Raising a ``ExchangeError`` exception if converting money from one currency to another fails. Before was just returning ``None``

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- First version!