merge of features from hosted branch (#7)

major merge of features from the hosted branch that was created temporarily during the initial launch of jambonz.org

lib/routes/api/webhooks.js

@@ -0,0 +1,21 @@
+const router = require('express').Router();
+const Webhook = require('../../models/webhook');
+const decorate = require('./decorate');
+const sysError = require('../error');
+
+decorate(router, Webhook, ['add']);
+
+/* retrieve */
+router.get('/:sid', async(req, res) => {
+  const logger = req.app.locals.logger;
+  try {
+    const results = await Webhook.retrieve(req.params.sid);
+    if (results.length === 0) return res.status(404).end();
+    return res.status(200).json(results[0]);
+  }
+  catch (err) {
+    sysError(logger, res, err);
+  }
+});
+
+module.exports = router;