Keep exit code from outer scope

[gfranco]

Not sure is it a bug, but coa doesn't keep an exit code if process.exit was called somewhere outside.

process.once('uncaughtException', () => {
  process.exit(1);
});

setTimeout(() => {
  throw Error('0_o');
}, 500);

require('coa').Cmd()
  .name('Ololo').title('Ololo')
  .act(() => {
    setTimeout(() => console.log('OK'), 1000);
  })
  .run(process.argv.slice(2));

Expected Result:
Exit code 1

Actual Result:
Exit code 0

[coveralls]

Coverage remained the same at 69.714% when pulling 54ff3f6 on gfranco:patch-1 into 05bd8dd on veged:master.

[qfox]

Thank you very much, I'll try to publish this asap.

[qfox]

Published in 2.0.1