WIP
make the test a little more usable
make fixtures skip subsequent setups after we see a failure
Not gonna use these tripwire asserts.
Add tests for more exceptional cases in [class_](setup|teardown). The method-level tests don't work yet :/.
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After much printf debugging, I have convinced myself the behavior was right all along and the tests were wrong. :/
Docstring for stop_setups
Merge pull request #208 from Yelp/mrtyler_exception_during_setup

on failure during [class_]setup, stop running additional setups