Move SnapshotView to SnapshotViewIOS and create an unimplemented android version

Reviewed By: @andreicoman11

Differential Revision: D2536373

fb-gh-sync-id: 0f671e8198175a15540b74d54e53eee941aa0c1b

Libraries/RCTTest/SnapshotViewIOS.android.js

@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule SnapshotViewIOS
+ */
+'use strict';
+
+module.exports = require('UnimplementedView');