Allow the notes to be refreshed by pulling from the top

lib/screens/home_screen.dart

@@ -17,12 +17,7 @@ class HomeScreen extends StatelessWidget {
       child: new Icon(Icons.add),
     );
 
-    return new Scaffold(
+    var journalList = JournalList(
-      appBar: new AppBar(
-        title: new Text('GitJournal'),
-      ),
-      floatingActionButton: createButton,
-      body: new JournalList(
       notes: appState.notes,
       noteSelectedFunction: (noteIndex) {
         var route = new MaterialPageRoute(
@@ -33,6 +28,18 @@ class HomeScreen extends StatelessWidget {
         );
         Navigator.of(context).push(route);
       },
+    );
+
+    return new Scaffold(
+      appBar: new AppBar(
+        title: new Text('GitJournal'),
+      ),
+      floatingActionButton: createButton,
+      body: Center(
+        child: RefreshIndicator(
+          child: journalList,
+          onRefresh: container.syncNotes,
+        ),
       ),
       drawer: new AppDrawer(),
     );

lib/state_container.dart

@@ -96,6 +96,33 @@ class StateContainerState extends State<StateContainer> {
     });
   }
 
+  Future syncNotes() async {
+    try {
+      await noteRepo.sync();
+    } catch (err, stack) {
+      print("Notes Repo Sync Error: " + err.toString());
+      print(stack.toString());
+      return true;
+    }
+
+    try {
+      appState.isLoadingFromDisk = true;
+      var loadedNotes = await noteRepo.listNotes();
+      setState(() {
+        appState.isLoadingFromDisk = false;
+        appState.notes = loadedNotes;
+      });
+    } catch (err, stack) {
+      setState(() {
+        print("Load Notes From Disk Error: " + err.toString());
+        print(stack.toString());
+        appState.isLoadingFromDisk = false;
+      });
+    }
+
+    return true;
+  }
+
   void _syncNotes() {
     print("Starting to syncNOtes");
     this.noteRepo.sync().then((loaded) {