Send2trash

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* Throw ``WindowsError`` instead of ``OSError`` in ``plat_win``. (7)
* Fix ``TypeError`` on python 2 in ``plat_other``. (12)

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* Added support for Gnome's GIO.
* Merged Python 3 and Python 2 versions in a single codebase.

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* Improved ``plat_other`` to follow freedesktop.org trash specification.

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* Converted compiled modules to ctypes so that cross-platform compilation isn't necessary anymore.

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* Fixed bugs with external volumes in plat_other.

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* Fixed memory leak in OS X module.