Expose MockUser class

Author: dmurvihill

src/index.js

@@ -3,6 +3,7 @@
 var MockFirestoreDeltaDocumentSnapshot = require('./firestore-delta-document-snapshot');
 
 exports.MockAuthentication = require('./auth');
+exports.MockUser = require('./user');
 exports.MockFirebase = require('./firebase');
 exports.MockFirebaseSdk = require('./sdk');
 exports.MockFirestore = require('./firestore');