code: function serveapp (directory) {
  	/* istanbul ignore next */
  	return async function serveEmberAPP (ctx, next) {
  		await next();
  		if (!ctx.body) {
  			await ctx.render(directory);
  		}
  	};
  }
docs: Creates the public handler for a EmberApp.
  @private
  @param {string} directory - The path where the EmberApp is located relative to public folder
  @return {async function(ctx: KoaContext, next: KoaNext)} renders the view