Adds packager configuration to support windows platform

Summary:
This pull request is a prerequisite to enabling the react-native-windows platform extension.

In the Resolver component, we need to add 'windows' to the list of platforms that are allowed in the DependencyGraph.  We also need to add 'react-native-windows' (the name of the Windows platform extension NPM module) to the `providesModuleNodeModules` option. This allows the node_module folder check in the DependencyGraphHelper from node-haste to be bypassed for *.windows.js files in the Windows NPM package.

For good measure, I also included a change to blacklist.js to ensure .windows.js files are ignored when the packager is parameterized on a platform.
Closes https://github.com/facebook/react-native/pull/7639

Differential Revision: D3327771

Pulled By: mkonicek

fbshipit-source-id: d1080b045ff6aa0cbf05d8070ceb0eb4cdb6dceb

blacklist.js

@@ -27,14 +27,22 @@ var platformBlacklists = {
   web: [
     '.ios.js',
     '.android.js',
+    '.windows.js'
   ],
   ios: [
     '.web.js',
     '.android.js',
+    '.windows.js',
   ],
   android: [
     '.web.js',
     '.ios.js',
+    '.windows.js'
+  ],
+  windows: [
+    '.web.js',
+    '.ios.js',
+    '.android.js'
   ],
 };
 

react-packager/src/Resolver/index.js

@@ -95,13 +95,14 @@ class Resolver {
       providesModuleNodeModules: [
         'react',
         'react-native',
+        'react-native-windows',
         // Parse requires AsyncStorage. They will
         // change that to require('react-native') which
         // should work after this release and we can
         // remove it from here.
         'parse',
       ],
-      platforms: ['ios', 'android'],
+      platforms: ['ios', 'android', 'windows'],
       preferNativePlatform: true,
       fileWatcher: opts.fileWatcher,
       cache: opts.cache,