Add a coroutine_wrapper decorator

This decorator checks for the coroutine=True keyword arg and wraps the
result of the function call in a coroutine if it isn’t.

This allows to have constructs like:

@coroutine_wrapper
def toto(xmpp, *, coroutine=False):
    if xmpp.cached:
        return xmpp.cached
    else:
        return xmpp.make_iq_get().send(coroutine=coroutine)

@asyncio.coroutine
def main(xmpp):
    result = yield from toto(xmpp, coroutine=True)
    xmpp.cached = result
    result2 = yield from toto(xmpp, coroutine=True)

If the wrapper wasn’t there, the second fetch would fail. This decorator
does not do anything if the coroutine argument is False.

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