Write new PM2 deployment documentation #834

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• I'm submitting a ...
  [ ] bug report
  [x] feature request
  [ ] question about the decisions made in the repository
• Do you want to request a feature or report a bug?

I'm requesting updated documentation for PM2 deployment.

• What is the current behavior?

The PM2 documentation is outdated.

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via
  https://plnkr.co or similar (you can use this template as a starting point: http://plnkr.co/edit/tpl:AvJOMERrnz94ekVua0u5).
• What is the expected behavior?

Updated PM2 deployment documentation.

• What is the motivation / use case for changing the behavior?

I was trying to deploy with the documentation I wrote, but no luck.

• Please tell us about your environment:
• Angular version: 2.0.0-beta.X
• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]

Angular verions 2.0.0 rc-4

• Other information (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, gitter, etc)