Add pm2 init to bootstrapping

[grtjn]

Roughly:

• You need a pm2 user (id -u pm2, see http://stackoverflow.com/a/14811915/918496)
• sudo npm install -g pm2
• sudo pm2 startup centos -u pm2 --hp /home/pm2 --no-daemon
• sudo service pm2-init.sh start

After that you should be able to do stuff like:

• sudo -u pm2 pm2 list

[grtjn]

For pm2 deploy setup you also need to be able to access /space/projects with your own user (without sudo). Do:

• sudo chown :sshuser /space/projects
• sudo chmod g+w /space/projects

[grtjn]

You probably also want to setup an ssh key in your git account, and install that key on the server too. You can then do git clone without user/pwd. Just make sure the git server fingerprint is known in your rsa hosts list.