title: NODE_APP_INSTANCE error with node-config and PM2
body: <p>So I've been having some problems with PM2 and node-config. Whenever I run my app with PM2, I get the error; <code>FATAL: NODE_APP_INSTANCE value of '0' did not match any instance config file names.</code></p>
  
  <p>I've tried all the documented ways of "fixing" this such as making a <code>default-0.json/js</code> file, setting the <code>instance_var</code> variable in my pm2 config, and I even tried setting an actual system environment variable, but nothing is working.</p>
  
  <p>I was wondering if anyone had any ideas on how I could fix this?</p>