Currently, asyncio doesn't provide any helper to read asynchronously data from
sys.stdin, like input(). Twisted implements twisted.internet.stdio:
https://twistedmatrix.com/trac/browser/trunk/twisted/internet/stdio.py
https://twistedmatrix.com/trac/browser/trunk/twisted/internet/_posixstdio.py
https://twistedmatrix.com/trac/browser/trunk/twisted/internet/process.py#L106
https://twistedmatrix.com/trac/browser/trunk/twisted/internet/_win32stdio.py
See also https://code.google.com/p/tulip/issues/detail?id=147