Portend

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Add support for Python 2.6 (to support CherryPy).

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Automatically deploy tagged versions via Travis-CI.

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Moved hosting to Github.

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Added ``find_available_local_port`` for identifying a local port
available for binding.

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Only require ``pytest-runner`` when pytest is invoked.

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Renamed functions:

- wait_for_occupied_port: occupied
- wait_for_free_port: free

The original names are kept as aliases for now.

Added execution support for the portend module. Invoke with
``python -m portend``.