added bulk to indexeddb

src/jio.storage/indexeddbstorage.js

@@ -346,6 +346,30 @@
         });
     });
   };
+  
+  IndexedDBStorage.prototype.bulk = function (content) {
+    return waitForOpenIndexedDB(this._database_name, function (db) {
+      return waitForTransaction(db, ["metadata"], "readwrite",
+                                function (tx) {
+            var i, 
+              length = content.length, 
+              promise_list = [],
+              store = tx.objectStore("metadata"),
+              add_to_queue = function(item){
+                promise_list.push(
+                  waitForIDBRequest(store.put({
+                    "_id": item.id,
+                    "doc": item.metadata
+                  }))
+                );
+              };
+            for (i=0; i < length; i+=1){
+              add_to_queue(content[i]);
+            }
+            return RSVP.all(promise_list);
+        });
+    });
+  };
 
   IndexedDBStorage.prototype.remove = function (id) {
     return waitForOpenIndexedDB(this._database_name, function (db) {