Pass through command flags that kyt doesn't use

[ccpricenytimes]

We want to support other flags that kyt isn't using so developers can pass down command line options to tools we use.

Example of use case here d2e2ad8#commitcomment-18973379

[tizmagik]

Here's an example of how this can be done, but specific to one command, test, it would be good to generalize this solution:

https://github.com/NYTimes/kyt/blob/feature/jest/cli/actions/test.js#L17 with
https://github.com/NYTimes/kyt/blob/feature/jest/cli/actions/test.js#L30