Add ability to daemonize fakes3 server. Fixes #109.

[jchristi]

Adds a command line argument to allow daemonizing the server process.

[basicBrogrammer]

Yes please 👍

[pickhardt]

Hi @jchristi,

Thanks for the pull request!

Sorry for the delayed response. I really like this.

I can merge it in if you do two things first:

1. Can you resolve the merge conflicts? I must've made some changes since you made the PR. Apologies for not reviewing this sooner. I took over as lead maintainer recently and am gradually making progress going over the old PRs and issues.

2. We have a contributor license agreement (CLA) based off of Google and Apache's CLA. If you would feel comfortable contributing to, say, Angular.js, you should feel comfortable with this CLA.

Go here to sign the CLA: https://docs.google.com/forms/d/e/1FAIpQLSeKKSKNNz5ji1fd5bbu5RaGFbhD45zEaCnAjzBZPpzOaXQsvQ/viewform

Thanks a lot, and if you do those I promise I'll get to it sooner than last time!

[jchristi]

Sorry, I do not support CLAs. That is a mistake for a small project like this and scares away potential contributors like me. If you change your mind about that requirement then I will consider re-submitting my patches.