Add po2json as a dev dependency

Author: ezmiller

package.json

@@ -113,6 +113,7 @@
     "eslint-plugin-standard": "^1.1.0",
     "jest-cli": "^0.5.10",
     "jest-webpack": "^0.2.1",
+    "po2json": "^0.4.1",
     "react-hot-loader": "^1.3.0",
     "redux-devtools": "^3.0.0-beta-3",
     "redux-logger": "^1.0.6",