Remove process.exit(0) on run.

[jaridmargolin]

  api[command](args)
    .then(() => process.exit(0))
    .catch(err => {
      if (err) {
        console.error(err);
      }

      process.exit(1);
    });

I am curious as to why .then(() => process.exit(0)) needs to be chained off of the api command. As long as the catch does not hit, the process will already exit with a 0, correct?

This also has consequences of stopping execution of various plugins. For example BundleAnalyzer executes after webpack has compiled.

[eliperelman]

Resolved in #119.