feat(gui): Add desktop notification setting

This adds a setting to disable desktop notifications, to be controlled
via configuration file

Change-Type: feat

lib/gui/app/os/notification.js

@@ -17,6 +17,7 @@
 'use strict'
 
 const electron = require('electron')
+const settings = require('../models/settings')
 
 /**
  * @summary Send a notification
@@ -41,6 +42,11 @@ const electron = require('electron')
  * });
  */
 exports.send = (title, options) => {
+  // Bail out if desktop notifications are disabled
+  if (!settings.get('desktopNotifications')) {
+    return null
+  }
+
   // `app.dock` is only defined in OS X
   if (electron.remote.app.dock) {
     electron.remote.app.dock.bounce()

lib/shared/store.js

@@ -104,7 +104,8 @@ const DEFAULT_STATE = Immutable.fromJS({
     updatesEnabled: packageJSON.updates.enabled && !_.includes([ 'rpm', 'deb' ], packageJSON.packageType),
     includeUnstableUpdateChannel: !release.isStableRelease(packageJSON.version),
     lastSleptUpdateNotifier: null,
-    lastSleptUpdateNotifierVersion: null
+    lastSleptUpdateNotifierVersion: null,
+    desktopNotifications: true
   }
 })