support IPv6

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[jimfulton]

Thanks for doing this!

[jimfulton]

I'm going to add travis later before merging this.

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Travis is already on. And tests pass.

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@jimfulton I wonder if there is a need to expand tests to run under IPv6. Or if we trust underlying infrastructure.

[jimfulton]

Oops

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@jimfulton Would you mind giving me permission on PyPI to release ? (userid gotcha)

[jimfulton]

Released 2.1.0. Thanks again.

[jimfulton]

I also made you a pypi owner.

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Thanks

[jimfulton]

FWIW, I find parts of asyncio(/trollius) to be very similar to ngi. Working on the networking for ZEO 5 was very similar to working with ngi. I thought of making an asyncio backend for ngi, but decided it would be better, at least for new code, to just use asyncio.