Upgrade babel-transform-react-native to v2.0.0

Summary: Upgrades `babel-transform-react-native` to v2.0.0, which exposes a factory function. That way, the preset will include/exclude dev tools according to `process.env.NODE_ENV` even when that value changes over time.

Reviewed By: cpojer

Differential Revision: D5246801

fbshipit-source-id: 74a1e7e0fb1476750e1fe21ce4befd475907b415

package.json

@@ -149,7 +149,7 @@
     "babel-polyfill": "^6.20.0",
     "babel-preset-es2015-node": "^6.1.1",
     "babel-preset-fbjs": "^2.1.3",
-    "babel-preset-react-native": "^1.9.2",
+    "babel-preset-react-native": "^2.0.0",
     "babel-register": "^6.24.1",
     "babel-runtime": "^6.23.0",
     "babel-traverse": "^6.24.1",