pm2 as user

[jarosser06]

• consolidated helper methods into lwrp
• added ability to run pm2 as a user
• added tests for change
• added home attr to pm2_application

[gdelvalle]

:+1: .Not running a root would be a big win

[jarosser06]

Fixed

[miguelcnf]

Looks really good generally - just left a couple of comments inline.

Let me run kitchen and I'll merge it if it's good.

[jarosser06]

Thanks! I removed the pm2_config instance var, it should be good to go.