Run dev-expression plugin only in production

Author: mjackson

modules/.babelrc

@@ -4,7 +4,11 @@
     "stage-1",
     "react"
   ],
-  "plugins": [
-    "babel-plugin-dev-expression"
-  ]
+  "env": {
+    "production": {
+      "plugins": [
+        "dev-expression"
+      ]
+    }
+  }
 }