Add startup() to store API

src/store/memory.js

@@ -21,6 +21,7 @@ limitations under the License.
  */
  const utils = require("../utils");
  const User = require("../models/user");
+ const q = require("q");
 
 /**
  * Construct a new in-memory data store for the Matrix Client.
@@ -288,4 +289,12 @@ module.exports.MatrixInMemoryStore.prototype = {
     getSyncAccumulator: function() {
         return null;
     },
+
+    /**
+     * Startup does nothing as this store doesn't require starting up.
+     * @return {Promise} An immediately resolved promise.
+     */
+    startup: function() {
+        return q();
+    },
 };

src/store/stub.js

@@ -15,6 +15,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 "use strict";
+import q from "q";
 /**
  * This is an internal module.
  * @module store/stub
@@ -193,6 +194,14 @@ StubStore.prototype = {
     getSyncAccumulator: function() {
         return null;
     },
+
+    /**
+     * Startup does nothing.
+     * @return {Promise} An immediately resolved promise.
+     */
+    startup: function() {
+        return q();
+    },
 };
 
 /** Stub Store class. */