Support async use-cases

Since we're supporting both python2 and python3, our async options are very limited. I think we have to either use gevent, use threading, or maybe we can use something from the twisted stack?

Personally, I'd really like to just drop support for python2 (it is the way the ecosystem is moving anyway), and use either the 3.4 syntax of @asyncio.coroutine and yield from or 3.5+ of async def and await. It would give us much more semantic code. Maybe the right answer is just a community-maintained async fork for python 3.4+.

Issue created to separate out discussion from #126.

Commencez par lire cette discussion avec l’issue #126 afin de comprendre le contexte distinct et les options proposées avec gevent, threading, Twisted et Python 3 asyncio. L’issue n’identifie ni fichiers, ni tests, ni cible d’implémentation arrêtée ; une décision concrète et des critères d’acceptation clairement délimités sont nécessaires avant de pouvoir commencer le travail.