Update open source env

Summary:
We weren't exposing a mock for the batched bridge, which resulted in the WebSocket test failure but only in the open source copy of react-native.

public

Reviewed By: voideanvalue, vjeux

Differential Revision: D2782151

fb-gh-sync-id: e896097dd6060bc26963bc4c23db87b7277b3eba

Author: cpojer

jestSupport/env.js

@@ -10,3 +10,9 @@
 
 require('../packager/react-packager/src/Resolver/polyfills/babelHelpers.js');
 global.__DEV__ = true;
+global.__fbBatchedBridgeConfig = {
+  remoteModuleConfig: [],
+  localModulesConfig: [],
+};
+
+global.Promise = require('promise');