build(js.cjs): re-enable tests that now pass in cjs

previously these tests were failing but now they pass on master

tools/broccoli/trees/node_tree.ts

@@ -21,11 +21,9 @@ module.exports = function makeNodeTree(destinationPath) {
   var modulesTree = new Funnel('modules', {
     include: ['angular2/**', 'benchpress/**', 'rtts_assert/**', '**/e2e_test/**'],
     exclude: [
+      // the following code and tests are not compatible with CJS/node environment
       'angular2/src/core/zone/vm_turn_zone.es6',
-      'angular2/test/core/application_spec.js',
-      'angular2/test/core/testability/**',
       'angular2/test/core/zone/**',
-      'angular2/test/render/**',
       'angular2/test/forms/integration_spec.js'
     ]
   });