Tracer support#20

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mattbennett wants to merge 20 commits intomasterfrom

Commits on Jan 17, 2019

Commits on Jan 18, 2019

need to be able to throw exceptions from every tee
mattbennett
committed

Commits on Jan 20, 2019

checkpoint: basic implementation and tests
mattbennett
committed

Commits on Jan 21, 2019

Commits on Jan 24, 2019

refactor check_trace callback to accept data and key, not just value
mattbennett
committed
test that response field is not present on error traces
mattbennett
committed

Commits on Jan 25, 2019

Commits on Jan 28, 2019