Test downstream projects

Use Tornado's selector thread on Windows/asyncio/ProactorEventLoop #1866

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Run time

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Job	Run time
ipyparallel	20m 13s
jupyter_client	5m 48s
jupyter_kernel_test	44s
ipywidgets	43s
nbclient	2m 6s
qtconsole	1m 34s
spyder_kernels	1m 48s
	32m 56s