Move dispatcher into a subdirectory

We're expecting to have a whole bunch of types for the dispatched payloads, so pull the thing into a directory we can throw them in.

src/createRoom.js

@@ -19,7 +19,7 @@ import {MatrixClientPeg} from './MatrixClientPeg';
 import Modal from './Modal';
 import * as sdk from './index';
 import { _t } from './languageHandler';
-import dis from "./dispatcher";
+import dis from "./dispatcher/dispatcher";
 import * as Rooms from "./Rooms";
 import DMRoomMap from "./utils/DMRoomMap";
 import {getAddressType} from "./UserAddress";