Import: Wait until db writes resolve before saying we're done (#1401)

FREEBIE

js/storage.js

@@ -29,7 +29,9 @@
                 console.log('Called storage.put before storage is ready. key:', key);
             }
             var item = items.add({id: key, value: value}, {merge: true});
-            item.save();
+            return new Promise(function(resolve, reject) {
+                item.save().then(resolve, reject);
+            });
         },
 
         get: function(key, defaultValue) {
@@ -44,8 +46,11 @@
             var item = items.get("" + key);
             if (item) {
                 items.remove(item);
-                item.destroy();
+                return new Promise(function(resolve, reject) {
+                    item.destroy().then(resolve, reject);
+                });
             }
+            return Promise.resolve();
         },
 
         onready: function(callback) {