use versioning for service worker and web app manifest

public/service-worker.js

-const CACHE_NAME = 'static-cache-v10';
+const CACHE_NAME = 'static-cache-v11';
 const FILES_TO_CACHE = [
   '/offline.html',
-  '/static/v10/css/materialize.min.css',
-  '/static/v10/css/material-icons.css',
-  '/static/v10/css/local.css',
-  '/static/v10/js/jquery-2.2.4.min.js',
-  '/static/v10/js/materialize.min.js',
-  '/static/v10/js/travelynx-actions.min.js',
+  '/static/v11/css/materialize.min.css',
+  '/static/v11/css/material-icons.css',
+  '/static/v11/css/local.css',
+  '/static/v11/js/jquery-2.2.4.min.js',
+  '/static/v11/js/materialize.min.js',
+  '/static/v11/js/travelynx-actions.min.js',
 ];
 
 self.addEventListener('install', (evt) => {

public/static/manifest.json

@@ -3,27 +3,27 @@
   "short_name": "travelynx",
   "scope": "/",
   "icons": [{
-    "src": "/static/icons/icon-128x128.png",
+    "src": "/static/v11/icons/icon-128x128.png",
       "sizes": "128x128",
       "type": "image/png"
     }, {
-      "src": "/static/icons/icon-144x144.png",
+      "src": "/static/v11/icons/icon-144x144.png",
       "sizes": "144x144",
       "type": "image/png"
     }, {
-      "src": "/static/icons/icon-152x152.png",
+      "src": "/static/v11/icons/icon-152x152.png",
       "sizes": "152x152",
       "type": "image/png"
     }, {
-      "src": "/static/icons/icon-192x192.png",
+      "src": "/static/v11/icons/icon-192x192.png",
       "sizes": "192x192",
       "type": "image/png"
     }, {
-      "src": "/static/icons/icon-256x256.png",
+      "src": "/static/v11/icons/icon-256x256.png",
       "sizes": "256x256",
       "type": "image/png"
     }, {
-      "src": "/static/icons/icon-512x512.png",
+      "src": "/static/v11/icons/icon-512x512.png",
       "sizes": "512x512",
       "type": "image/png"
     }],

templates/layouts/default.html.ep

@@ -8,9 +8,9 @@
 	<meta name="apple-mobile-web-app-capable" content="yes">
 	<meta name="apple-mobile-web-app-status-bar-style" content="black">
 	<meta name="apple-mobile-web-app-title" content="Weather PWA">
-	<link rel="apple-touch-icon" href="/static/icons/icon-152x152.png">
-	<link rel="manifest" href="/static/manifest.json">
-	% my $av = 'v10'; # asset version
+	% my $av = 'v11'; # asset version
+	<link rel="apple-touch-icon" href="/static/<%= $av %>/icons/icon-152x152.png">
+	<link rel="manifest" href="/static/<%= $av %>/manifest.json">
 	%= stylesheet "/static/${av}/css/materialize.min.css"
 	%= stylesheet "/static/${av}/css/material-icons.css"
 	%= stylesheet "/static/${av}/css/local.css"