code: function executeCommand(parameters) {
      const configFilePath = path.join(process.cwd(), plugin.config.rolesPath);
      return mkdirpAsync(configFilePath)
      .then(() => {
        if (parameters.model !== 'none') {
          // Case a preset config has been choosen
          const src = path.join(__dirname, 'templates', 'roles', parameters.model + '.json');
          const dest = path.join(configFilePath, parameters.identifier + '.json');
          return ncpAsync(src, dest);
        } else {
          // Case no preset config has been choosen
          const config = {
            'managed-policies': parameters.policies,
            'inline-policies': [],
            'trust-relationship': {
              Version: '2012-10-17',
              Statement: [{
                Effect: 'Allow',
                Principal: { AWS: '*'},
                Action: 'sts:AssumeRole'
              }]
            }
          };
          // We save the specification in a json file
          return fs.writeFileAsync(configFilePath + path.sep + parameters.identifier + '.json', JSON.stringify(config, null, 2));
        }
      })
      .then(() => {
        const msg = '\n  The IAM role ' + icli.format.info(parameters.identifier)
                  + ' has been created in ' + icli.format.info(configFilePath + path.sep + parameters.identifier + '.json') + '\n';
        icli.print(msg);
      });
    }
docs: Create the new role
  @param {Object} parameters - the parameters provided in the command and in the prompt
  @returns {Promise<null>} - The execution stops here