Make sure exit code is zero on unhandled promise rejection in node

[arichiardi]

Hello @bensu and all!

I know this is controversial and I can handle it myself in my side of the code but I was wondering whether it makes sense to adopt the following solution by default for :node targets in case of unhandled promise rejection.

https://medium.com/@dtinth/making-unhandled-promise-rejections-crash-the-node-js-process-ffc27cfcc9dd

Leaving this here for further discussion.

[Lambeaux]

+1, although @arichiardi I think you mean "non-zero", correct?

We got hit by this. Builds were passing in Jenkins despite the tests actually failing.