code: function mergeApp(env, app, conf, ENV, fn) {
    fetch(conf, 'apps', function(err, apps) {
      if (err) return fn(err);
      debug('# APP');
      debug(app);
      mergeConf(env, apps, app, ENV, fn);
    });
  }
docs: Merge app into ENV
  
  @param {String} env
  @param {String} app
  @param {Object} conf
  @param {Object} ENV
  @param {Function} fn