travis: Disable MacOS X; Add proper Python 3.5 target.
travis: Disable MacOS X; Add proper Python 3.5 target.

Martiusweb/asyncio,gvanrossum/asyncio,ajdavis/asyncio,ajdavis/asyncio,ajdavis/asyncio,vxgmichel/asyncio,vxgmichel/asyncio,Martiusweb/asyncio,gvanrossum/asyncio,vxgmichel/asyncio,gvanrossum/asyncio,Martiusweb/asyncio