code: function logEvents(verbInst) {
    verbInst.on('err', function () {
      failed = true;
    });
  
    verbInst.on('task_start', function (e) {
      verbLog('starting', '\'' + chalk.cyan(e.task) + '\'');
    });
  
    verbInst.on('task_stop', function (e) {
      var time = prettyTime(e.hrDuration);
      verbLog('finished', '\'' + chalk.cyan(e.task) + '\'', 'after', chalk.magenta(time));
    });
  
    verbInst.on('task_err', function (e) {
      var msg = formatError(e);
      var time = prettyTime(e.hrDuration);
      verbLog(chalk.cyan(e.task), chalk.red('errored after'), chalk.magenta(time));
      verbLog(msg);
    });
  
    verbInst.on('task_not_found', function (err) {
      verbLog(chalk.red('task \'' + err.task + '\' is not in your verbfile'));
      verbLog('please check the documentation for proper verbfile formatting');
      exit(1);
    });
  }
docs: wire up logging events