Jason Jean edae03eaea feat(builders): add runInBand and maxWorkers options to jest (#757)
Fixes https://github.com/nrwl/nx/issues/754

## Current Behavior

`runInBand` and `maxWorkers` are useful for CI environments but are not available through the builder.

## Expected Behavior

Both `runInBand` and `maxWorkers` have been added and can be used as per [Jest Troubleshooting](https://jestjs.io/docs/en/troubleshooting#tests-are-extremely-slow-on-docker-and-or-continuous-integration-ci-server).

```sh
  --max-workers
    Max number of workers to run tests across. Useful for CI. (https://jestjs.io/docs/en/cli.html#maxworkers-num)
  --run-in-band
    Run tests in a single process as opposed to multiple workers. Useful for CI. (https://jestjs.io/docs/en/cli.html#runinband)
```
2018-09-14 11:58:34 -04:00
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