perf(React): use babel optimisation option for React

It will:
- inline React elements as object literals
- hoist static React elements

See https://facebook.github.io/react/blog/2015/10/07/react-v0.14.html

Author: vvo

.babelrc

@@ -2,6 +2,9 @@
   "env": {
     "test": {
       "plugins": ["babel-plugin-rewire"]
+    },
+    "production": {
+      "optional": ["optimisation"]
     }
   },
   "stage": 2