Membership registration & payment API (#4)

* remove newrelic from use in devenv

* add endpoint for membership payments

* fix some wierd spaces

* minor code styling and logging stuff

* replace non-breaking spaces with normal ones

* remove duplicate function

* minor code styling

* add functionality for writing new member to google sheets

* add config example

* update example config, start using config in google credentials

* remove var creds from google sheets auth

* rename config.example to config.template and fix readme

* add async and google-spreadsheet packages

* rename workingWithRows to addRow

* return missing header from readme

* minor code styling

* flatten google config structure, add address fields

* add request validation to membership endpoint

* fix config field names

* more error handling, fix indentation

utils/validateRequest.js

@@ -0,0 +1,12 @@
+var Joi = require('joi');
+
+module.exports = function validateRequest(schema) {
+  return function handler(req, res, next) {
+    Joi.validate(req.body, schema, function (err, value) {
+      if(err) {
+        return res.status(400).send(err.details)
+      }
+      next();
+    });
+  }
+}