Attempt to clean up asyncio.ClientSession objects #10
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The global cache (with WeakKeyDictionary) is not sufficient for ipython, for some reason. This change is a little simplistic (for example, we do see closed event loops and are hence unable to trigger close() calls on captive ClientSessions).
@arahlin's more complete option can be found in pone-software/perseus, and is a little longer, a little more intrusive, but doesn't cut corners. We may end up adopting it if this doesn't survive a little testing.