Gs-core

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* Adding the ``mailto`` function

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* Fixing an error due to `using a list as a default argument`_

.. _using a list as a default argument:
http://effbot.org/zone/default-values.htm

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* Renamed all the ``*txt`` files as ``*rst`` files, for GitHub
support.

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* Switched to Sphinx documentation
* Tweaked the ``to_unicode_or_bust`` slightly

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* Python 3 support
* Added unit tests

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* Initial version

+ ``to_ascii``
+ ``to_unicode_or_bust``
+ ``curr_time``
+ ``to_id``
+ ``comma_comma_and``