Add a fallback class using select() -- always there.
Add a fallback class using select() -- always there.

Martiusweb/asyncio,gvanrossum/asyncio,gvanrossum/asyncio,Martiusweb/asyncio,1st1/asyncio,vxgmichel/asyncio,overcastcloud/trollius,overcastcloud/trollius,Martiusweb/asyncio,jashandeep-sohi/asyncio,manipopopo/asyncio,gsb-eng/asyncio,1st1/asyncio,gsb-eng/asyncio,haypo/trollius,overcastcloud/trollius,haypo/trollius,fallen/asyncio,manipopopo/asyncio,leetreveil/tulip,ajdavis/asyncio,fallen/asyncio,ajdavis/asyncio,leetreveil/tulip,vxgmichel/asyncio,jashandeep-sohi/asyncio,fallen/asyncio,manipopopo/asyncio,haypo/trollius,leetreveil/tulip,gvanrossum/asyncio,ajdavis/asyncio,jashandeep-sohi/asyncio,1st1/asyncio,gsb-eng/asyncio,vxgmichel/asyncio