import(asset, options) {
    options = options || {};
    options.resolveFrom = options.resolveFrom || this.root;

    let app = this._findHost();
    app.import(asset, options);
  }
Imports an asset into this addon.

     @public
     @method import
     @param {Object|String} asset Either a path to the asset or an object with environment names and paths as key-value pairs.
     @param {Object} [options] Options object
     @param {String} [options.type] Either 'vendor' or 'test', defaults to 'vendor'
     @param {Boolean} [options.prepend] Whether or not this asset should be prepended, defaults to false
     @param {String} [options.destDir] Destination directory, defaults to the name of the directory the asset is in
     @since 2.7.0