Add fetching of older statuses.

src/components/timeline/timeline.vue

@@ -8,6 +8,13 @@
       </div>
     </a>
     <status v-for="status in timeline.visibleStatuses" :key="status.id" v-bind:statusoid="status"></status>
+    <a href="#" v-on:click.prevent='fetchOlderStatuses()' v-if="!timeline.loading">
+      <div class="new-status-notification">
+        <p class="text-center" >
+          Load older statuses.
+        </p>
+      </div>
+    </a>
   </div>
 </template>
 <script src="./timeline.js"></script>