Wolframalpha-asyncio

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``pmxbot`` plugin now requires that the "Wolfram|Alpha API key"
config parameter be supplied. The hard-coded key has been
removed and will be de-activated. Users must register for their
own key at the `Wolfram|Alpha developer web site
<https://developer.wolframalpha.com>`_.

Additionally, the tests now no longer bundle a hard-coded API
key. Instead, to run the tests, one must supply a
``WOLFRAMALPHA_API_KEY`` environment variable.

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Add pmxbot module and plugin, superseding pmxbot-wolframalpha package.

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Moved hosting to Github.

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Rely on six for urllib compatibility.

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Added Python 3 compatibility.

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Initial release.