Convertish

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* added json converter with tests

BUG FIX: Tuple conversion broke if too many items were supplied..

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Reverting previous fix.. convert should leave None along in both directions.

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BUG FIX: string converters ``from_type``s were returning None - should always
be an empty string

BUG FIX: string converters ``to_type``s were checking for None - they should
expect an empty string for an none representation

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!! API CHANGES !!

* fromType becomes from_type
* toType becomes to_type

Cleaned up repo and fixed bad style in some method attributes and method names

* Added files recommended by pypi including license

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NOTE: First External Release