Update to allow any new Traceur, and use Traceur Runner

For the benefits of Traceur Runner, see [its readme](https://github.com/domenic/traceur-runner). I put it together because I noticed a lot of code similar to your makeDefault trick, but I wanted something more robust.

Also, it'd be pretty cool if you were willing to bump the version to 1.0.0 after releasing :). I like my dependencies to be semver-compatible.

If you perchance have moved on from this project (I noticed the last commit was in April), I'd be happy to help maintain it.