_initProject(options) {
    let app = this;

    this.project = options.project || Project.closestSync(process.cwd());

    if (options.configPath) {
      this.project.configPath = function () {
        return app._resolveLocal(options.configPath);
      };
      this.project.configCache.clear();
    }
  }
Initializes the `project` property from `options.project` or the
    closest Ember CLI project from the current working directory.

    @private
    @method _initProject
    @param {Object} options