Currencies

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* Update Rupee symbol.
* Added minor modification for Python 3 compatibility.
* Add AFN cureency.

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* Introduce ``config`` module.
* Move constant variables from ``initializer`` to ``config`` module.
* Raise exception if currency does not exist.
* Add Usage examples to ``README.rst``.
* Add Tests section to ``README.rst``

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* Support many currencies.
* Full test suit.
* %100 test coverage.
* Initial release.