Fix #19 : coverageText and unquoted options

This fixes the `coverageText` not being considered a `valuedOption`. It also changes the valued options output from `--option value` to `--option="value"`. Both work but the second one is safer and avoid common errors with spaces and stuff in the option's value.

```js
coverage: {
    options: {
        coverageText: 'app/tests/coverage.txt',
    }
}
```