This patch is supposed to facilitate using the asyncio 
package on the command line. It contains two things:

First, a coroutine version of builtin.input, so that
it can be called while a asyncio event loop is running.

Secondly, it adds a new flag to builtin.compile which
allows to use the yield and yield from statements on 
the module level, making compile always return a generator.

The latter part will enable us to run commands like the
following on the command line:

>>> from asyncio import sleep
>>> yield from sleep(3)

(This has been discussed on python-ideas,
https://mail.python.org/pipermail/python-ideas/2014-September/029293.html)