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add WorkerPool wrapper, fix --grep

- created a wrapper around the `workerpool` module to help decouple and give us a place to do serialization before invoking the worker's `run` method
- do not warn about dubious max worker count (`jobs` option) since it's not something we can be sure is an actual problem (make it debug output instead)
- adds [serialize-javascript](https://npm.im/serialize-javascript) module
    - allows easier transmission of non-JSON-compatible objects over IPC, e.g., a `RegExp` (for `--grep`)
    - requires use of `eval()` to deserialize.  I'm not too worried about this, but I think I need to play with it more
    - this avoids more custom serialization code, but is not especially helpful when serializing `Test`, `Suite` and `Hook` instances
- in the integration test helper code, if we provide an _absolute path_, do not make a guess about where the fixture is when running `runMocha` or `runMochaJSON`. this makes globs easier to use

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