Add pull to refresh to album view

www/templates/album.html

@@ -13,6 +13,10 @@
    </ion-nav-buttons>

    <ion-content class="scroll-bg" ng-init="refresh()">
        <ion-refresher
                pulling-text="Pull to refresh..."
                on-refresh="refresh()">
        </ion-refresher>
        <div class="multi_items_row">
            <div class="photo" ng-repeat="photo in album.photos">
                <img ng-src="{{ photo.thumbUrl }}" ng-click="showGallery({{$index}})">