Add fetching of older statuses.

src/components/timeline/timeline.js

@@ -1,4 +1,5 @@
 import Status from '../status/status.vue'
+import timelineFetcher from '../../services/timeline_fetcher/timeline_fetcher.service.js'
 
 const Timeline = {
   props: [
@@ -11,6 +12,18 @@ const Timeline = {
   methods: {
     showNewStatuses () {
       this.$store.commit('showNewStatuses', { timeline: this.timelineName })
+    },
+    fetchOlderStatuses () {
+      const store = this.$store
+      const credentials = store.state.users.currentUser.credentials
+      store.commit('setLoading', { timeline: this.timelineName, value: true });
+      timelineFetcher.fetchAndUpdate({
+        store,
+        credentials,
+        timeline: this.timelineName,
+        older: true,
+        showImmediately: true
+      }).then(() => store.commit('setLoading', { timeline: this.timelineName, value: false }))
     }
   }
 }