Parallel

This uses `parallel_tests` to run some cukes in parallel.

```
real    9m29.327s
user    0m7.570s
sys     0m0.700s
```

with:

```
real    3m49.818s
user    0m10.913s
sys     0m1.037s
```

On my system. I'm not sure if four threads is optimal.

I cleaned up some of the other task related things: now that we're not running with anything failing, we shouldn't need that original, bootstrap infrastructure.