Removed isomorphic-fetch from non-test code (#8)

src/client/client.js

@@ -1,8 +1,6 @@
 // Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
 
-import 'isomorphic-fetch';
-
 const HEADER_AUTH = 'Authorization';
 const HEADER_BEARER = 'BEARER';
 const HEADER_REQUESTED_WITH = 'X-Requested-With';

test/mocha.opts

@@ -1,2 +1,3 @@
 --require react-native-mock/mock.js
+--require isomorphic-fetch
 --recursive

test/sanity.test.js

@@ -1,7 +1,6 @@
 // Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
 
-import 'isomorphic-fetch';
 import 'react-native';
 
 // Ensure that everything is imported correctly for testing