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/stores/GroupStore.js

@@ -18,7 +18,7 @@ import EventEmitter from 'events';
 import { groupMemberFromApiObject, groupRoomFromApiObject } from '../groups';
 import FlairStore from './FlairStore';
 import {MatrixClientPeg} from '../MatrixClientPeg';
-import dis from '../dispatcher';
+import dis from '../dispatcher/dispatcher';
 
 function parseMembersResponse(response) {
     return response.chunk.map((apiMember) => groupMemberFromApiObject(apiMember));