Bump the number of test reruns even higher

[jhamrick]

This is an interim effort to deal with the IOPub timeouts we're getting in the windows tests, until jupyter/nbconvert#513 is merged and released. Not sure if this will actually help all that much, but let's see!

cf #644
cc @lgpage

[jhamrick]

Meh. So far, does not seem to really help.

[jhamrick]

Woo! Ok, the combination of bumping the number of reruns, and also re-executing notebooks if necessary, seems to have done the trick. Hacky solution, but good enough for now at least! 🎉

[lgpage]

Found this while trying to sort some other issue I have with running tests:

On Windows, the default proxy setting may cause a massive network latency (see Known Issues in the release note). The workaround is to disable proxy completely, e.g. by launching PhantomJS with --proxy-type=none command-line argument.

I wonder if this would help with running tests?

[jhamrick]

Hmm, interesting. I don't know if it will fix the problem but it's worth a try!