Added service worker

src/service-worker.js

@@ -0,0 +1,18 @@
+var CACHE = 'v1';
+
+self.addEventListener('fetch', function(event) {
+  event.respondWith(fetchAndCache(event));
+});
+
+function fetchAndCache(event) {
+  return caches.open(CACHE).then(function (cache) {
+    return fetch(event.request)
+      .then(function(response) {
+        cache.put(event.request, response.clone());
+        return response;
+      })
+      .catch(function() {
+        return cache.match(event.request);
+      });
+  });
+}

templates/partials/head.html

@@ -33,4 +33,11 @@
 
   <link rel="stylesheet" href="/css/main.css?{{moment date 'YYYYMMDDHHMM'}}">
   <link rel="alternate" type="application/rss+xml" title="{{ site.title }}" href="{{ site.url }}/feed.xml">
+  <script>
+    if ('serviceWorker' in navigator) {
+      window.addEventListener('load', function() {
+        navigator.serviceWorker.register('/service-worker.js', { scope: '/' });
+      });
+    }
+  </script>
 </head>