[react-packager] check-in node_modules and update tests

react-packager/src/Packager/__tests__/Packager-test.js

@@ -6,6 +6,7 @@ jest
   .dontMock('q')
   .dontMock('os')
   .dontMock('underscore')
+  .setMock('uglify-js')
   .dontMock('../');
 
 var q = require('q');

react-packager/src/Server/__tests__/Server-test.js

@@ -10,6 +10,7 @@ jest.setMock('worker-farm', function() { return function() {}; })
         return setTimeout(fn, 0);
       }
     })
+    .setMock('uglify-js')
     .dontMock('../');
 
 var q = require('q');