Revert "remove babelrc"

This reverts commit 175689bd64.

.babelrc

@@ -0,0 +1,25 @@
+{
+  "env": {
+    "module": {
+      "presets": [
+        ["env", {
+          "targets": {
+            "node": "6",
+            "browsers": ["last 2 versions", "safari >= 7", "not ie < 11"]
+          },
+          "modules": false
+        }],
+        "react"
+      ]
+    },
+    "main": {
+      "presets": ["env", "react"]
+    }
+  },
+  "plugins": [
+    "babel-plugin-transform-object-rest-spread",
+    "babel-plugin-transform-class-properties",
+    "babel-plugin-transform-runtime",
+    "babel-plugin-transform-es2015-classes"
+  ]
+}