Python3.6: Added support for await in list contractions
Python3.6: Added support for await in list contractions

* After the recent re-factorings for list contractions to be
  outlines, this was now really easy.

* This corrects GH#29.

kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka,kayhayen/Nuitka