Updated to tart-tracing@0.1.3.
Implemented revocable test example: 'npm run revocable-example'.
Merge pull request #1 from tristanls/dep-tart-tracing@0.1.3

Updated to tart-tracing@0.1.3.
Merge pull request #2 from tristanls/revocable-example

Implemented revocable test example: 'npm run revocable-example'.
Pull `test.done()` out of `dispatch()`

Leave test.done() in the test itself, where it will be visible and
expected.  Also, this allow draining the event queue multiple times (if
desired) before ending the test.