[Tests] Update tests to run on io.js with the latest version of jest

Updates the tests in small ways so they run on io.js with two updates:

 - The animation tests use `toBeCloseTo` since there are small math discrepancies between versions of V8
 - The Cache test which relies on Promises uses `runAllImmediates` for modern versions of Node because bluebird uses `setImmediate` instead of `process.nextTick` for Node >0.10.

Test Plan: Run `npm test` with the latest version of jest.

.travis.yml

@@ -7,7 +7,8 @@ cache:
 before_install:
   - brew update
 install:
-  - brew reinstall flow xctool
+  - brew reinstall flow iojs xctool
+  - brew unlink node && brew link --force iojs
   - npm config set spin=false
   - npm install
 

package.json

@@ -68,7 +68,7 @@
     "yargs": "1.3.2"
   },
   "devDependencies": {
-    "jest-cli": "0.4.5",
+    "jest-cli": "ide/jest#iojs",
     "eslint": "0.9.2"
   }
 }

packager/react-packager/src/JSTransformer/__tests__/Cache-test.js

@@ -229,7 +229,8 @@ describe('JSTransformer Cache', function() {
         return Promise.resolve('baz value');
       });
 
-      jest.runAllTicks();
+      jest.runAllTicks();       // Node 0.10  (bluebird uses nextTick)
+      jest.runAllImmediates();  // Node 0.12+
       expect(fs.writeFile).toBeCalled();
     });
   });