Updated packages to remove vulnerabilities reported by npm

Implementation of feedcheck - not tested though

lib/senders.js

@@ -0,0 +1,58 @@
+'use strict';
+
+const fork = require('child_process').fork;
+const log = require('npmlog');
+const path = require('path');
+
+let messageTid = 0;
+let senderProcess;
+
+function spawn(callback) {
+    log.info('Senders', 'Spawning master sender process');
+
+    senderProcess = fork(path.join(__dirname, '..', 'services', 'sender-master.js'), [], {
+        cwd: path.join(__dirname, '..'),
+        env: {NODE_ENV: process.env.NODE_ENV}
+    });
+
+    senderProcess.on('message', msg => {
+        if (msg) {
+            if (msg.type === 'master-sender-started') {
+                log.info('Senders', 'Master sender process started');
+                return callback();
+            }
+        }
+    });
+
+    senderProcess.on('close', (code, signal) => {
+        log.error('Senders', 'Master sender process exited with code %s signal %s', code, signal);
+    });
+}
+
+function scheduleCheck() {
+    senderProcess.send({
+        type: 'scheduleCheck',
+        tid: messageTid
+    });
+
+    messageTid++;
+}
+
+function reloadConfig(sendConfigurationId) {
+    senderProcess.send({
+        type: 'reloadConfig',
+        data: {
+            sendConfigurationId
+        },
+        tid: messageTid
+    });
+
+    messageTid++;
+}
+
+module.exports = {
+    spawn,
+    scheduleCheck,
+    reloadConfig
+};
+