Add fetcher_helper for calendar and newsfeed

js/fetcher_helper.js

@@ -0,0 +1,12 @@
+const FetcherHelper = {
+	checkStatus: function (response) {
+		// response.status >= 200 && response.status < 300
+		if (response.ok) {
+			return response;
+		} else {
+			throw Error(response.statusText);
+		}
+	}
+};
+
+module.exports = FetcherHelper;