configWithoutCache(env) {
    let configPath = this.configPath();

    if (fs.existsSync(`${configPath}.js`)) {
      let appConfig = this.require(configPath)(env);
      let addonsConfig = this.getAddonsConfig(env, appConfig);

      return merge(addonsConfig, appConfig);
    } else {
      return this.getAddonsConfig(env, {});
    }
  }
@private
@method configWithoutCache
@param  {String} env Environment name
@return {Object}     Merged configuration object